Answers
Answer:
1:Gravity acts on all masses equally, even though the effects on both masses may be different because gravity causes all objects to fall at the same constant rate of 9.8 m/s2. An object in free fall means that the only force acting on the object is gravity
2:Our universe began with an explosion of space itself - the Big Bang. Starting from extremely high density and temperature, space expanded, the universe cooled, and the simplest elements formed. Gravity gradually drew matter together to form the first stars and the first galaxies.
3:A scientific theory is an explanation of something in the natural world that is based on past observations and evidence.
4:In biology, cell theory is the historic scientific theory, now universally accepted, that living organisms are made up of cells, that they are the basic structural/organizational unit of all organisms, and that all cells come from pre-existing cells.
Explanation:
Related Questions
name and describe the two types of food making found among autotrophs and give an example of each. Which is quantitatively more important to life on earth (which are there more of)?
Answers
Answer:
See the answer below
Explanation:
Autotrophs are organisms that have the capacity to manufacture their foods from freely available inorganic products. There are two types of autotrophs
1. The photosynthetic autotrophs: these are green plants and blue-green algae that possess chlorophyll. The chlorophyll is used to trap radiation from the sun in the presence of water and carbon dioxide to manufacture carbohydrates which serve as their primary foods.
[tex]6CO_2 + 6H_2O + sunlight --> C_6H_1_2O_6 + 6O_2[/tex]
2. The chemosynthetic autotrophs: these are usually bacteria that make use of energy from inorganic chemicals (such as hydrogen sulphide, iron sulphide, etc) to reduce carbon dioxide and produce carbohydrates in the process.
[tex]CO_2 + 4H_2S + O_2 -> CH_2O + 4S + 3H_2O[/tex]
Photosynthesis is quantitatively more important to life on earth because green plants form the base of several food chains. The energy locked in the carbohydrate produced during photosynthesis is important for other lives in the ecosystem and this is passed on through the various levels in the food chain. Also, the by-product of photosynthesis, the oxygen, is important for the survival of most life on earth who depends on oxygen for respiration. Chemosynthesis only occur in habitats where the radiant energy of the sun is lacking, such as hydrothermal vents.
What is physical appearance of traits called?
Answers
Answer:
Explanation:
The observable traits expressed by an organism are referred to as its phenotype. An organism's underlying genetic makeup, consisting of both physically visible and non-expressed alleles, is called its genotype.
__________ is a mixture of minerals, organic matter, liquids, and gases that can provide a medium for plant growth.
A)
Sand
B)
Clay
C)
Soil
D)
Silt
E)
Humus
Which species have a short life span and reproduce in large numbers over a short period of time?
A)
threatened species
B)
invasive species
C)
k-selected species
D)
nonnative species
E)
r-selected species
Answers
Answer:
The first question is the C and second is E
Explanation:
On your visit to New York City, you and your friend observed that the grey rats (Rattus norvegicus) in the New York subway are considerably larger than a typical West Coast rat. You decided to test whether this difference was genetic or environmental. You obtained a litter of 10 New York rat pups, and a litter of 10 California rat pups. Each of you took 5 pups from each litter and kept them in your room for 3 months, despite your roommates' protests. You fed your rats a balanced diet of dry cat food and fresh fruit and vegetables. Your friend, however, has a soft heart and gave her rats french fries, cheeseburger wraps, hot dogs, and other nostalgic New York fare. At the end of your experiment, you found that the New York and California rats that grew up in your home were exactly the same size. Your friend, however, found that her New York rats were larger than her California rats, and both were larger than your rats. So, is the difference genetic or environmental?
Explain why you concluded this.
a. Genetic
b. Environmental
c. Genotype environment interaction
d. a and b
e. b and c
f. a and c
g. a, b, and c
Answers
Answer:
d. a and b
Explanation:
The difference in the size of both rats are due to genetic and environmental because rats of both location increased in size which eats a lot of food as compared to those rats which eats balanced diet. This is due to the environment while on the the other hand, due to difference in genetics, New York rats grew larger than California rats of your friend which eats large number of food. So we can say that both genetic and environmental factors affect the rats size.
Genetic variation can occur during meiosis because of the process of ________
1.crossing over
2.cell division
3.fertilization
Answers
Answer:
crossing over
Explanation:
During prophase of meiosis I, the double-chromatid homologous pairs of chromosomes cross over with each other and often exchange chromosome segments. This recombination creates genetic diversity by allowing genes from each parent to intermix, resulting in chromosomes with a different genetic complement.
Genetic variation can occur during meiosis because of the process of crossing over.
What do you mean by crossing over?Crossing over is a cellular process that happens during meiosis when chromosomes of the same type are lined up. When two chromosomes one from the mother and one from the father line up, parts of the chromosome can be switched.
Crossing over is an enzyme-mediated process, where the exchange of genetic material between non-sister chromatids of homologous chromosomes takes place. It occurs at the pachytene stage of prophase I of meiosis.
During crossing over, part of one chromosome is exchanged with another. The result is a hybrid chromosome with a unique pattern of genetic material.
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origin of life of the theory of endosymbiosis
Answers
Answer: The theory of endosymbiosis means that eukaryotes(plants and animals) formed from prokaryotes (bacteria and archaeabacteria).
Explanation:
18) What is the difference between eumelanin and pheomelanin?
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Answer:
Eumelanin is black or brown pigment and pheomelanin is red or yellow pigment
During cytokinesis, the cell membrane ________ until two daughter cells separate completely.
A
expands
B
dissolves
C
pinches in
D
spins around
Answers
Why? - Cytokinesis is the physical process of cell division, which divides the cytoplasm of a parental cell into two daughter cells. The contractile ring shrinks at the equator of the cell, PINCHING the plasma membrane or cell membrane inward
Help I will give brainliest I need help with 12
Answers
Answer: A
Explanation: I hope this helps!
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the greenhouse effect is bad the cause of climate change and we needed to get rid of it true or false question?
Answers
Answer:
hmmmm thats too hard. plez give brianliest.
Explanation:
answer is true
answer is true
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answer is true
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answer is true
answer is true
Answer:
Its true
Explanation:
because it is (:
Hello help pls :)!!!!!!
Answers
Hope this’ll help! ^^
of the cell. *
15) DNA is located in the
O Vacuole
O Nucleus
O Cytoplasm
O Membrane
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The DNA is located in the nucleus which are chromosomes
Which stage of the cell cycle happens directly after cytokinesis?
A
mitosis
B
M phase
C
anaphase
D
interphase
Answers
The cell cycle phase that occurs immediately following cytokinesis is the interphase, which is in Option D because the interphase consists of the G1, S, and G2 and is constitutively called the preparatory phase.
What is the cell cycle's importance?The cell cycle consists of the interphase and the division phase, and in the interphase, the cell spends most of the time preparing itself for the cell division and consists of the G1, S, and G2 phases. Following the interphase, the cell enters the division phase, which is mitosis or meiosis, and divides, with the daughter cells potentially entering the cell cycle via the interphase.
Hence, the cell cycle phase that occurs immediately following cytokinesis is the interphase, which is in Option D because the interphase consists of the G1, S, and G2 and is constitutively called the preparatory phase.
Learn more about the cell cycle here.
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What are the PRODUCTS (what is made) of aerobic respiration? Select all that apply
Answers
Answer:
carbon dioxide and water
What would the complementary mRNA sequence be for the base sequence
on the DNA template shown here?
C-C-T-A-G-T-A-T-G
a. C-C-T-A - G-T-A-T-G
b. G-G-A-T-C-A-T-A-C
c. G-G-A-U-C-A-U-A-C
d. C-C-U-A -G-U-A-U-G
Answers
Answer:
(c) G-G-A-U-C-A-U-A-C
Complete a model to explain the molecular events occurring at each stage of this reaction profile. Rank the stages from the first to the last one.
The substrate molecules are entering the cells, so no product is made yet As the substrate is used up, the rate decreases (the slope is less steep)
The line is flat because no new substrate remains and thus no new product appears
There is sufficient substrate, so the reaction is proceeding at a maximum rate
Section A Section D
Answers
Answer:
The substrate molecules are entering the cells, so no product is made yet.
There is sufficient substrate, so the reaction is proceeding at a maximum rate
As the substrate is used up, the rate decreases (the slope is less steep)
The line is flat because no new substrate remains and thus no new product appears
Explanation:
First the substrate molecules enters in the cell and no product is produced because the reaction is not started yet. When the reaction starts, the substrate is in large amount while on the other hand, the amount of product is low. As the reaction proceed forward, concentration of substrate is lowering and concentration of product is increasing. When all the substrate used up, so no new product is formed.
Organisms that are capable of
chemosynthesis are considered
A. autotrophs.
B. carnivores.
C. omnitrophs.
Answers
Answer: Chemoautotrophs like algae and plankten are able to use chemosynthesis for thier food.
So maybe it's autotrophs since they don't eat plant's or meat.
Which sustainable practice is paired correctly with its impact on the environment?
Answers
Answer:
Setting irrigation systems to run longer results in a reduction of water use is an example of a correct pairing of a sustainable practice and its impact to the environment.
Answer:
c
Explanation:
factorize this polynomial function
x³-7x+6
Hint:x³-7x+6=0
Answers
Answer:
(x - 1)(x - 2)(x + 3)
Explanation:
f(x)=x3-7x+6 Since (a + b + c + d = 0), then f(1) = 0 --> one factor if (x - 1).
After division -->
f(x)=(x-1)(x2f2+x-6). The trinomial in parentheses can be factored.
Find 2 numbers knowing sum (1) and product (-6). They are -2 and 3.
Therefor, f(x)=(x-1)(x-2)(x+3)
True or false Solutions of equal solute concentration are isotonic.
Answers
Answer:
Explanation:
now you have two mixtures of different solute concentrations. In comparing two solutions of unequal solute concentration, the solution with the higher solute concentration is hypertonic, and the solution with the lower solute concentration is hypotonic. Solutions of equal solute concentration are isotonic.
A) Identify a human disorder with developmental limitations that results from changes in chromosome number. Explain how nondisjunction leads to changes in chromosome number.
B) Mutations result in changes to genotype that can result in changes in phenotype. Explain how a mutation causes a change in the genotype of an organism AND may result in a change in the phenotype of an organism.
Answers
Answer:A) Patau Syndrome (Trisomy 13) causes intellectual and physical disability, such as underdeveloped eyes, extra fingers/toes, heart defects. Survival beyond the first year is uncommon.
B)
Explanation: Trisomy (or aneuploidy in general) can result when chromosomes to do not separate correctly during mitosis or meiosis. In meiosis, non-separation of a chromosome pair results in a gamete with two copies of the chromosome (and consequently one gamete lacking the chromosome.
At fertilisation the embryonic cell will have three copies of the chromosome (and an embryonic cell with one copy only). These are serious mutations, many of which are non-viable and usually abort spontaneously. Others results in abnormal development and poor survival rates. Only one autosomal trisomy (21) and sex chromosome trisomies (XXX, XXY etc) result in babies that survive into adulthood, albeit with physical and developmental abnormalities (trisomy 21 abd trisomy X). Only one monosomy (XO) is viable.
Other mutations can be less inimical, and may not result in any variation from normal. Mutations in genes coding for proteins or ribosomes may result in potential loss of function. As there are two copies of each gene, the mutated gene is paired with a normal gene and if that is expressed there will be no loss of function.
There are cases where the mutated gene is dominant it will change the phenotype. An example is Marfan Syndrome, an autosomal (chromosome 15) dominant mutation resulting in connective tissue abnormalities and long bones.
An autosomal recessive mutation is not expressed but is carried. If both parents are carriers, the probability of offspring to be doubly recessive and have an altered phenotype is 25%. Cystic fibrosis is an example.
A third possibility is where two alleles are co-dominant. An example of this is sickle cell disease. Consider the three allele pairs SS, Ss and ss.
Those with ss have sickle cell anaemia, a painful and debilitating condition. Those with SS have normal blood cells. Those with Ss have sickle cell trait, which has some mild deficits because a proportion of blood cells are abnormal.
In the United States, it is possible for discoverers of gene sequences in organisms to patent those sequences. This gives the discoverer property rights for the sequence. Many scientists object to this practice. Which is the strongest scientific argument against allowing a gene sequence to be patented?
Answers
Answer:Are gene sequences patentable under existing law?
Explanation:
Why do you think your immune system sometimes fails and we get sick anyway?
Answers
Answer:
If you've noticed that you're often sick, feel fatigued or have other nagging symptoms you can't figure out, it may mean your immune system is weakened (OwO)
Explanation:
Your immune system can also be weakened by smoking, alcohol, and poor nutrition. AIDS. HIV, which causes AIDS, is an acquired viral infection that destroys important white blood cells and weakens the immune system. People with HIV/AIDS become seriously ill with infections that most people can fight off.
The term used to describe one of the possible forms of a character
Answers
Answer:
personality
Explanation:
do you mean traits or characteristics
On Isle Royale, wolves are the main predators of moose. The graph shows the changing wolf and moose populations on the island over a 50-year time span.
The graph plots the populations of moose and wolves in separate lines from 1955 to 2005. The two populations appear to follow opposite trends: when one population is higher, the other population is lower.
Which statement provides the strongest explanation for the trends in the two populations?
A. The populations of predators and prey are limited by abiotic factors only.
B. Predation acts a density-dependent limiting factor on prey, but not on predators.
C. Predation acts as a density-independent limiting factor on predators, but not on prey.
D. Predator-prey relationships act as density-dependent limiting factors on both predators and prey.
Answers
Answer:
D
Explanation:
The statement provides the strongest explanation for the trends in the two populations is predator-prey relationships act as density-dependent limiting factors on both predators and prey. Hence option D is correct.
What is predator?Predator is defined as an organism that mostly hunts and consumes other organisms for food. The term "predator" refers to a species that hunts and eats specific other organisms. The animals that predators consume are referred to as prey.
Predator-prey interactions and prey-predator interactions are both crucial density-dependent population controls. The other population's size determines how each population changes in size. When the population density reaches a particular point, a density-dependent limiting factor takes effect. Competition, parasitism, and disease are other instances of density-dependent limiting variables.
Thus, the statement provides the strongest explanation for the trends in the two populations is predator-prey relationships act as density-dependent limiting factors on both predators and prey. Hence option D is correct.
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Please help I’ll give brainliest to whoever’s right
Answers
Answer:
This is confusing I think theres missing info. Sorry
Explanation:
List six changes that take place if you smoke.
Answers
Answer:
1. Lung damage
2.Heart disease
3.Quitting
4.Vision problems
5.Type 2 diabetes
6.Fertility problems
The creation of new crust at the middle of mid-ocean ridges is also
referred to as... *
A.mountain formation
B.sea floor spreading
C.fault formation
D.a transform boundary
Answers
Answer:
B.sea floor spreading
Explanation:
The creation of new crusts at the middle of the mid- ocean ridges is also sea floor spreading.
The process of sea floor spreading entails the creation of new crusts at the margin of the oceanic crusts.
Basaltic materials from the subsurface upwells to the surface.
They cool and solidifies to form new crusts. The old crust is moved behind and away from the margin. This way, sea floor is formed and it spreads in like manner.
At this margin sea floor is created and at a convergent margin, it is destroyed.
Five substances that are not pure
Answers
I need help due today please
Answers
Bauxite is a sedimentary rock with a relatively high aluminium content. It is the world's main source of aluminium and gallium.
Answer:
sedimentary
Explanation: