Answer:
I believe it's a physical change?
Explanation:
Mixing sand and gravel is considered a physical change as it only affects the physical properties, such as appearance and distribution, without altering the chemical nature of the substances involved.
A physical change is a transformation that does not alter the chemical composition or identity of a substance. In the case of mixing sand and gravel, both substances retain their individual properties and characteristics even when they are combined.
The sand particles and gravel particles remain unchanged in terms of their chemical composition.
The mixing process involves the physical interaction of sand and gravel particles, resulting in a uniform distribution of the two components. This change in arrangement does not involve any chemical reactions or the formation of new substances.
The sand and gravel can be easily separated by physical means, such as filtration or sieving, without undergoing any chemical transformations.
Therefore, mixing sand and gravel is considered a physical change as it only affects the physical properties, such as appearance and distribution, without altering the chemical nature of the substances involved.
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Which statement describes a law based on a tested hypothesis explains how the process occurs describes something about the natural world subject to change as new evidence is discovered
Answer:
based on a tested hypothesis
Explanation:
Laws are generally based on tested hypotheses.
Theories are first derived from repeatedly tested and proven hypotheses. Scientific laws are derived from theories that have been proven to be true over a wide range of phenomenon. Hence, laws are overwhelmingly proven facts that cannot be changed.
Scientific laws are internally consistent, compatible with evidence, and are testable against a wide range of phenomenon. However, they can be reviewed as more evidences emerge that have not been known before.
You are comparing the density of sea water to the density of fresh water. (Remember,
density is mass divided by volume.) Describe how you could determine the density of
sea water, including the names of the equipment needed to make the required
measurements.
Answer:
To know and compare the difference between the density of the fresh water and salt water or sea water require a graduated cylinder, balance, and weighing machine. The graduated cylinders are the containers that have markings on them to measure the volume of the liquid.
First, fill the cylinder with 1000 ml of fresh water which is the measure of the volume. now weight the cylinder filled with the fresh water and then find the difference between filled and empty container divide the mass of the fresh water by its volume, the result is the density of fresh water.
Repeat the process with salt water or sea water. The answer would be sea water has more density than fresh water.
In what stage does DNA synthesis occur? And what gets produced?
S phase; homologous pairs
S phase; sister chromatids
G phase, homologous pairs
G phase, sister chromatids
Answer:S phase
Explanation: or aka the 3rd phase
True or false a mutation is a random change in DNA
false let me now if this helps
In rabbits, straight ears (E) are dominant to floppy ears (e), Two rabbits are crossed, and 50% of their offspring have floppy ears. Which cross represents the
genotypes of the parents?
EEXEE
EE x ee
Ee x EE
Ee x ee
Answer: Ee x ee
Explanation:
Answer:
The correct answer is Ee x ee :)
Explanation:
i tHoUgHt yOu WeRe aMeRiCaN
Answer:
i am lol
Explanation:
Answer:
I am :)
Explanation:
transcription & translation worksheet
anyone know how to do this?
3. Run the simulation four times and record the post-drought frequencies in the table.
Trial
1
2
3
4
Average
Blue Allele
T5
.5
.625
.5
.53125
Red Allele
.5
.5
.375
.5
.46875
Blue Phenotype
.25
.25
.39
.25
.285
Purple Phenotype
.5
.5
47
.5
.4925
Red Phenotype
.25
.25
.14
.25
.225
4. Describe your results.
I
to search
O
Explanation:
xndsjsnssjsjzjsjdjxjxnfnddjduxuyy t t arc rey ye yes dhdjdjd
The ? era featured the longest periods with no life forms on Earth.
A Palezoic
B. Precambrian
C. Cenozoic
D. Mesozoic
Answer:
B. Precambrian
Explanation:
True or False? My brain refuses to compute.
Volume is defined as the amount of mass that an object has.
Answer: true
Explanation: it takes up as much space as it has
What happens to energy that is transmitted through or reflected off a material?
When light is transmitted through or reflected off a material, the light is converted into heat.
What is light?Light is an entity that make things visible to eyes. It is an electromagnetic radiation. It can not be produced or end, it's just converted into one form to another form.
The item may absorb the light wave, in which case its energy is changed to heat. The object might reflect the light wave. Additionally, the object might transmit the light wave. When this happens, things often selectively absorb, reflect, or transmit certain light frequencies.
The light is passed through some objects and do not get passed through some objects. The light that do not pass through an object is reflected back to the same place, but when it is not reflected, it converts into heat.
Therefore, the light is converted into heat when it is not reflected.
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Waste produced by agriculture, mining, households, industry and other
human activities can end up in which of the following?*
A: Oceans
B:groundwater
C:streams and rivers
D:all of the above
if the atmosphere is 21% oxygen and the cornea contains 15% oxygen, which direction will more of the oxygen molecules travel: into the cornea or out of the cornea
6. What are the key structures used in the translation process?
Answer:
Two types of molecules with key roles in translation are tRNAs and ribosomes.
Explanation:
Does this satisfy the octet rule why or why not
Answer:
No, it does not, because the octet rule says that an atom needs to have eight electrons in its valence shell to be stable. The exceptions are hydrogen and helium, which need only two electrons
Answer: No it doesn’t
Explanation:
Heredity is the way animals and plants pass traits on to their offspring. True False
Answer:
False
Explanation:
False because Plants and Animals get their traits from their parents. Each offspring is a mix of both parents
Why were Wegener's ideas about continental drift initially rejected
Answer:
The main reason that Wegener's hypothesis was not accepted was that he suggested no mechanism for moving the continents.
Explanation:
It wasn't until 1928 that a Scottish Geologist, Arthur Holmes, came up with an explanation for why continents move. He believed that heat traps in the Earth caused convection currents. There were areas where fluids trapped beneath Earth's crust heat up, rise, spread laterally, then cool and drop back down. This hypothesis didn't have a wide acceptance either but was revived in the 1940s and 1950s when scientists started to learn more about the seafloor and the magnetic properties of oceanic crust.
Hope this helps!
Brain-List?
What would "two pairs of chromosomes in the original cell" look like?
Answer:
Two X chromosomes for females and one X and one Y chromosomes for males.
Explanation:
the human body has 23 pairs of chromosomes, or 46 in total. This includes two sex chromosomes : because each chromosome has a pair, these cells are called "diploid" cells .
What is the graphical representation of age structure known as?
OA.
age group
OB. age graph
Oc. age scale
OD
age pyramid
Answer:
The graphical representation of the age structure is known as age pyramid (option D).
Explanation:
The age pyramid or more properly called population pyramid groups all the individuals of a population, distributing them by age and sex. The name is due to the fact that, in general, the bar graph resembles a pyramid.
The age groups are distributed in the pyramid by age from lowest (bottom) to highest (top), with the sexes forming the sides of the pyramid.
In emerging countries the population is relatively young, which makes the base of the pyramid wide, narrowing as it moves up to the upper age groups.
Age group, age graph or age scale do not correspond to the population graph where the age and sex structure of a population are expressed.
Answer:
Option D (i just took the test)
Explanation:
HELP ASAP
PLEASE !!!!
Why is suburban sprawl tightly linked with environmental problems caused by
transportation?
A. Commuters who live in suburbs are dependent on automobiles that emit air
pollution.
Х
B. Commuters who live in suburbs are more likely to walk and suffer from air
pollution
C. Commuters who live in suburbs are dependent on mass transit systems that
emit air pollution.
D. Commuters who live in suburbs are dependent on mass transit systems that
add to water pollution.
Which of the following has the stages of getting food products to consumers in the
correct order?
Distributer, wholesaler, retailer, packager
Harvester, wholesaler, processor, distributer
Processor, packager, harvester, retailer
Producer, packager, distributer, retailer
plssss this is for my final exam :(
Also this passage is related to the previous questions
Answer:
I dunno please gimme points and mark brainliest
Explanation:
When we speak of life possibly outside of Earth, we use the term ______
Answer:
Extraterrestrial.
Explanation:
It means of or from outside the earth or its atmosphere.
Answer:
we use the term extraterrestrial life
Explanation: extraterrestrial life is hypothetical life which may occur outside of earth and which did not originate on earth.
define immunology?
please answer this question
Answer: See explanation
Explanation:
Immunology is a vital branch of biological sciences that has to do with how the immune system is being studied.
The function of the immune system to our body is vital as it helps in protecting against diseases. The person that diagnose, and treats immunologic conditions, is referred to as an immunologist.
After radiation exposure, a cell that cannot divide will most likely stay in which phase?
Answer:
G0 phase
Explanation:
IF the cell doesn't receive a signal to divide, then it will go into a stage called the G0 phase. Most cells are in this stage until they receive a signal to divide, and then continue the cell cycle.
match each hypothesis with how the moon formed the statement that best describes it?
Answer:
the Moon and Earth formed at the same time from the same cloud of material. 4. Colliding planetesimal Hypothesis: As per this theory a lot of small rocky objects called as planetesimals collided and combined over a large period of time to form the Moon
Explanation:
Answer:
Giant Impact Theory: The Moon was formed from the collision between Earth and another Mars sized body
Colliding planetesimal Hypothesis: The Moon was formed from collisions and combining of planetesimals
Capture Hypothesis: The Moon was locked into orbit by Earth's gravity as it was passing by it
Accretion Hypothesis: The Moon was formed from the same cloud of material as Earth
(I apologize if this is not what you meant)
Albinism, the total lack of pigment, is due to a recessive gene. A man and woman plan to marry and wish to know the probability of their having any albino children. What are the probabilities if:
Both are normally pigmented, but each has one albino parent.
Dad is an albino, the mom is normal, but mom’s father is an albino.
Answer: if someone in the family carries the albino gene especially both parents genes or a possible ancestor it van be passed from 1st or second generations
Explanation:
what are infectious agents?
A. agents that investigate a different type of infection
B. attackers that can cause a response by the immune system
C. attacker that cannot cause a response by the immune system
D. infectious agents are always good for the human immune systeme
Explain how mitosis maintains the chromosome number
of the original cells when forming new cells.
Relation between mitosis and chromosomes:
During mitosis, a cell duplicates all of its contents, including its chromosomes, and splits to form two identical daughter cells. Because this process is so critical, the steps of mitosis are carefully controlled by certain genes. As they move, they pull the one copy of each chromosome with them to opposite poles of the cell. When mitosis is not regulated correctly, health problems such as cancer can result.When a cell divides by way of mitosis, it produces two clones of itself, each with the same number of chromosomes.
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A _____ is any push or pull in a direction.
1. force
2. inertia
3. friction
4. velocity
Answer:
1. force
Explanation:
A force is any push or pull in a direction.