Answer:
1,35 * 10 ^ -2 M
Explanation:
Recuerde que pH = -log [H ^ +]
Sea la concentración de iones de hidrógeno [H ^ +]
Si es así, entonces;
-pH = log [H ^ +]
Por lo tanto;
[H ^ +] = Antilog (-pH)
[H ^ +] = Antilog (-1,87)
[H ^ +] = 1,35 * 10 ^ -2 M
Sperm cells swim through liquid. Explain how a sperm cell is adapted to reduce friction as it swims.
Answer:
Long tail and narrow head.
Explanation:
A sperm cell is adapted to reduce friction as it swims by having long head, narrow tail and enzymes. These features of sperm provides ability to swim straight to the egg cell. Long tail helps the sperm cell to swim towards the egg cell, narrow head of sperm cell make the sperm cell for faster swimming towards the egg cell and enzymes present in the head of the sperm helps break through the egg cell membrane so we can say that the long tail and narrow head of sperm cells helps in faster swimming.
Marine biologists are studying stickleback fish populations. There are two distinct variations in the sticklebacks based on phenotypes. They are found with the three spines more commonly in marine ecosystems while they are more commonly found without the three spines in freshwater ecosystems. This has been observed in many marine and freshwater ecosystems across the globe. What explains the variation seen in the image here across different aquatic ecosystems?
Answer:
Presence of predators.
Explanation:
Presence and absence of predators is the main cause of the presence of spines on stickleback fish populations because these spines helps in the protection against predators. The stickleback fish populations that lives in marine ecosystem have spines because there are many predators are present while on the other hand, stickleback fish populations of freshwater ecosystems have no spines due to no predator so they acquire the adaptation of having no spines.
In this exercise we have to explain the variations of the aquatic system, so we have to:
In this case, as long as a large increase in a specific population of fish takes place, we know that the predators of this system are needed.
What factors interfere in an ecosystem?They are:
Biotic factors: producing beings (plants and algae), consuming beings (herbivores and carnivores) and decomposing beings (fungi and bacteria). Abiotic factors: water, light (light energy), heat (thermal energy) and nutrients (chemical substances).See more about ecosystem at brainly.com/question/1673533
1. According to the rules of carbon dating, how much time
passes during one half-life?
Answer:
5,730 yearsExplanation:5,730 years
Which statement best describes the fossil record?
It is a complete record.
It is an incomplete record.
Most fossils are older than five billion years.
All fossils are younger than six hundred years.
Answer:
incomplete record
Explanation:
I just took the test
Answer:
B It is an incomplete record.
Explanation:
Which of the following is true of biogeochemical cycles?
Choose 1 answers
They ensure that nutrients are only used once by organisms.
They increase the total amount of matter over time.
They can be affected by human activity,
They create new atoms to replace lost ones.
Answer: They can be affected by human activity.
Explanation:
Answer:
a
Explanation:
i got it right
Water molecules have oppositely charged ends, + and -
These opposite charges allow for them to form covalent
bonds with other water molecules which is how water
droplets form. What is this called?
a) viscosity
b) polarity
c) density
d) surface tension
Answer:
polarity is the answer.
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Edwin Hubble was an American astronomer who played a crucial role in collecting evidence to support the theory that the universe is constantly expanding outward and is not simply static. He used light from distance stars to calculate their movement.
Meanwhile, around this same period of time, a Russian physicist by the name of Mikhail Lomonosov worked tirelessly in his lab studying different chemical reactions. Lomonosov would later help in developing the Law of Mass Conservation which states that during a chemical reaction the total mass of the substances before the reaction is equal to the total mass after the chemical reaction.
How are the methods used in the pursuit of a scientific explanation different between Edwin Hubble and Mikhail Lomonosov?
A) Edwin Hubble carefully identified and manipulated variables to answer questions; Mikhail Lomonosov made observations about the natural world.
B) Edwin Hubble made observations about what he studied; Mikhail Lomonosov did not
C) Edwin Hubble and Mikhail Lomonosov both used scientific equipment and collected evidence
D) Edwin Hubble made observations about the natural world; Mikhail Lomonosov carefully identified and manipulated variables to answer questions.
Answer:
C
Explanation:
These type of questions leave a great deal to be desired. There is no mention of which way Hubble used and manipulated data. He studied the variations in light to determine his conclusions.
Nor is there any mention of what Lomonosov did to come to the conclusion that conservation of mass is a constant.
We don't know what was done to get the results. Hubble was studying the universe; the conclusions made by Lomonosov depended on lab equipment that was very delicate (I'm assuming). I doubt he manipulated variables. He measured what he got.
I think the answer is C, but the question has so many assumptions that it is hard to know what answer to pick.
State one importance of breeding in the vicinity of agriculture.
Answer:
One importance in breeding agriculture plants is to improve the plant's yield, resistance against diseases, and ability to survive in cold conditions.
(I'm assuming the question is asking what the importance is of artifically breeding plants, not literally breeding next to some plants. that would be weird)
i need help with this question please
Answer:
Raise the beams in less time
Explanation:
As the crane carries the beams in a lesser time its energy will reduce by time
¿Qué es una droga según la OMS?
¿Qué significa que la droga sea una sustancia psicoactiva?
¿Qué es una adicción?
¿Cuál es el efecto de las drogas depresoras?
¿Cuál es el efecto de las drogas estimulantes?
¿Cuál es el efecto de las drogas alucinógenas?
¿Qué es una droga legal?
¿Qué es el tabaquismo y cuáles son los daños a la salud que provocan?
¿Qué es el alcoholismo y cuáles son los daños que provocan a la salud?
¿Qué es la marihuana y qué efectos positivos y negativos provoca en la salud ?
Answer:
Uno... Una droga es cualquier sustancia (a excepción de los alimentos y el agua) que, cuando se ingiere, altera la función del cuerpo, ya sea física o psicológicamente. Las drogas pueden ser legales (por ejemplo, alcohol, cafeína y tabaco) o ilegales (por ejemplo, cannabis, éxtasis, cocaína y heroína).
Dos... Una droga u otra sustancia que afecta el funcionamiento del cerebro y provoca cambios en el estado de ánimo, la conciencia, los pensamientos, los sentimientos o el comportamiento. Ejemplos de sustancias psicoactivas incluyen alcohol, cafeína, nicotina, marihuana y ciertos analgésicos.
Tres... La adicción es un trastorno biopsicosocial que se caracteriza por el uso repetido de drogas o la participación repetitiva en un comportamiento como el juego, a pesar del daño a sí mismo y a los demás.
Cuatro... Cuando se usan depresores, los efectos a menudo incluyen ataxia, ansiolisis, alivio del dolor, sedación o somnolencia y deterioro cognitivo / de la memoria, así como en algunos casos euforia, disociación, relajación muscular, disminución de la presión arterial o frecuencia cardíaca, depresión respiratoria y anticonvulsivante. .efectos.
Cinco... Ansiedad; tensión; aumento de la temperatura corporal; náusea; temblor; convulsiones coma; muerte.
Seis... Los efectos de los alucinógenos, como el LSD, varían de persona a persona y dependen de la cantidad que se ingiera.
Siete... Las drogas legales son aquellas que se pueden vender, poseer y usar legalmente, aunque a menudo con ciertas restricciones. Incluyen tabaco, alcohol, cafeína, sustancias volátiles y medicamentos de venta libre y recetados. 2 Las drogas ilegales o controladas son aquellas cuya venta, posesión o uso constituye un.
Ocho... Fumar, el acto de inhalar y exhalar los vapores de material vegetal en llamas. Se fuma una variedad de materiales vegetales, incluida la marihuana y el hachís, pero el acto se asocia más comúnmente con el tabaco que se fuma en un cigarrillo, cigarro o pipa. Fumar causa cáncer, enfermedades cardíacas, accidentes cerebrovasculares, enfermedades pulmonares, diabetes y enfermedad pulmonar obstructiva crónica (EPOC), que incluye enfisema y bronquitis crónica. Fumar también aumenta el riesgo de tuberculosis, ciertas enfermedades oculares y problemas del sistema inmunológico, incluida la artritis reumatoide.
Nueve... Los órganos que se sabe que están dañados por el abuso de alcohol a largo plazo incluyen el cerebro y el sistema nervioso, el corazón, el hígado y el páncreas. El consumo excesivo de alcohol también puede aumentar la presión arterial y los niveles de colesterol en sangre, los cuales son factores de riesgo importantes de ataques cardíacos y accidentes cerebrovasculares.
Diez... Los aspectos positivos y negativos: Cómo la marihuana afecta su cerebro y su cuerpo ... También puede acelerar la pérdida de células cerebrales relacionada con la edad, aunque se ha demostrado que la marihuana ... El alcohol y los cigarrillos tienen efectos adversos para la salud mucho peores.
Espero haber ayudado!!!
what is the probability for a child to inherit one of two alleles from her dad??
a:100%
b: 50%
c: 0%
d: impossible to know
Answer:
100%
Explanation:
a child will get one allele from her mom and one from her dad.
Answer:
50%
Explanation:
the probability for a child to inherit one of two alleles from her dad is 50 persent.
If given the template strand of DNA below, what is the complementary sequence? 5’ A T G T A T G C C A A T G C A 3’
It would be T A C A T A C G G T T C G T
In what way(s) do we use energy?
A.All answers are correct
B.To make heat
C.To transport ourselves and products
D.To make electricity
Answer:
A. All answers are correct
30. Why was the paddlefish selected for study?
in what way a prokaryotic cell is different from eukaryotic cell with respect to nuclear
membrane?
Explanation:
There are several differences between the two, but the biggest distinction between them is that eukaryotic cells have a distinct nucleus containing the cell's genetic material, while prokaryotic cells don't have a nucleus and have free-floating genetic material instead.
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Which of the following is one of the reasons a sea breeze occurs during the day?
A
The land cools faster than the water.
B
The land cools slower than the water
С
The land warms faster than the water
D
The land warms slower than the water
Answer:
C
Explanation:
i took the test and it was on my study guide
A cup is surrounded by air in room temperature
Describe the energy transfer between the water and air if the system is at equilibrium
A.Energy is transfers from air to the water
B. Energy transfers from water to the air
C. Energy transfers back and forth between air and water
D.None of the above
The energy transfer between the water and air if the system is at equilibrium does not carry any transfer of energy. So, the correct option is D.
What do you mean by Equilibrium state?Equilibrium may be defined as a condition in the course of a reversible chemical reaction in which no net change in the amounts of reactants and products occurs.
When the system is at equilibrium, the energy transfer between water and air surrounding the cup does not take place. It will only take place when there is a difference between the concentration of two solutions or objects.
Therefore, the energy transfer between the water and air if the system is at equilibrium does not carry any transfer of energy.
To learn more about Energy transfer, refer to the link:
https://brainly.com/question/2667612
The process of photosynthesis only impacts plants and their ability to survive.
Group of answer choices
True
False
True
Explanation:
true because photo synthesis helps only to survive because they can prepare food only in persence of chlorophyll
Which muscle is highlighted below?
Answer:
pic?
Explanation:
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Answer: B
Explanation:
Evaluate the use of stem cells from a patients own bone marrow instead of stem cells from an embryo. You must give a conclusion.
Answer:
The stem cells are the special cells that can develop into different types of specialized cells. There are two major stem cells in the body. The one is an embryonic stem cell that presents in the initial divided few cells that have the ability to develop into any type of specialized cells.
The other one is adult stem cells such as Bone marrow that contains two types of stem cells: hemopoietic which has the ability to produce all three types of cells, and stromal that able to produce special muscles and bones due to their limited ability to develop specialized cells or multipotent.
Thus, embryonic stem cells are more useful than adult stem cells.
Which statements describe social behavior? Check all that apply.
What role does vasoconstriction play in thermoregulation
Explanation:
In endotherms, warm blood from the body's core typically loses heat to the environment as it passes near the skin. Shrinking the diameter of blood vessels that supply the skin, a process known as vasoconstriction, reduces blood flow and helps retain heat.Thus, the blood returning to the heart has not lost much heat.
Answer:
Reduces blood flow and helps retain heat thus the blood returning to the heart has not lost much heat
The ______ system helps us to break down our food.
A. digestive
B. muscular
C. circulatory
Answer:
A. digestive
Explanation:
Even if you chew the food, sometimes the food isn't break down properly. The digestive system would help break down food into tiny pieces.
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can we prepare slides without stain? justify.
Answer:
Yes, it is easier to prepare slides without using any stains however, will not be able to see the colorless bodies present in the cell so that the stains help us to easily see. Preparing the slides is quite easier without staining and they are not visible to clearly the eyes
Explanation:Yes, it is easier to prepare slides without using any stains however, will not be able to see the colorless bodies present in the cell so that the stains help us to easily see. Preparing the slides is quite easier without staining and they are not visible to clearly the eyes
What type of blood vessels returns blood to the heart?
If you get this right I will give you Brianliest even if you attempt.
Not lying
Answer:
The blood vessels that returns blood to the heart is the superior and inferior vena cave,along with the aorta,are the great vessel's involved in systemic circulation.
What is the technical term for having too little oxygen in your tissues?
Answer: Hypoxia
Explanation:
Many organizations release indexes used to measure the development of the world's countries. As we learned in this lesson, these indexes measure many factors, from life expectancy to happiness. In your opinion, what are the three most important factors we can use to determine how developed a country might be? Explain your answers in a few sentences. << Read Less
Answer:
The correct answer is - GDP nominal, human resources and right, and GDP per capita.
Explanation:
The three major and most reliable factors about determining the development of a country out of all the indexes are GDP nominal, the human rights index, and the GDP per capita.
The economy and production of a country can be shown by the GDP nominal if it is showing progress or declines.
The Average income of the citizen of the country is exhibited by GDP per capita to examine if the wealth of the country shares that gives an idea about rich, poor or the middle class.
The human rights index defines the basics of life expectancy and the rights they have that decides the happiness.
What are The two most important things when it comes to being more successful In science
Answer:
good communication and creativity
Explanation:
other answers could be attention to detail, analytical, and indepentdent thinkers
How is replication of an experiment important in a scientific investigation?