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miss Akunina [59]
3 years ago
15

The four essential elements for life are _______. a.carbon, hydrogen, oxygen and nitrogen b. carbon, hydrogen, oxygen and sulfur

c. carbon, nitrogen, oxygen and sulfur d. iron, nitrogen, oxygen and magnesium
Biology
2 answers:
umka21 [38]3 years ago
7 0
Answer is A to all my homies out derrr
Dmitrij [34]3 years ago
4 0
The correct answer is "A. carbon, hydrogen, oxygen and nitrogen".



Scientists believe that out of the 116 known elements, only 25 are used by mammals (and therefore by humans). Out of the 25 elements that are believed by scientists to support human life, only four of these elements - carbon, oxygen, hydrogen, and nitrogen - make up about 96% of the human body and are found in the basic structure of all biochemical molecules within the human body. Because of this, carbon, hydrogen, oxygen, and nitrogen are considered "the four essential elements" supporting human life. However, it is also important to keep in mind that although many of the other 25 elements present in the human body are required in only small amounts, they play an important role in keeping the body functioning correctly, as well.
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Identify what types of of questions that can be answered by science
mamaluj [8]

Answer:

There are many questions that can be answered by science but I will provide some examples below.

Explanation:

Science involves many areas of study, <u>from biology and chemistry to physics and neuroscience</u>. Generating questions and providing answers are the most important steps in science as this process has allowed thousands of scientists to develop new drugs to treat previously-mortal diseases, to protect endangered species, to prevent population declines, to understand the behavior of fauna, among many other remarkable outcomes and discoveries.

In this answer, I will focus on some questions belonging to the life sciences areas that can be answered by science:

Biology

<em>How does climatic phenomena, such as El Niño and La Niña, affect the migration of whales?</em>

<em />

Neuroscience (humans)

<em>Is schizophrenia hereditable?</em>

<em />

Behavioral Ecology

<em>Does climate change affect the capability of cuttlefish to camouflage?</em>

Neuroscience (Animals)

<em>Are killer whales capable of  problem-solving?</em>

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Ecology

<em>How does the reduction of apex predator populations (terciary consumers) affect the population of secondary consumers?</em>

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Conservation Biology

<em>Why do increased temperatures lead to coral bleaching? What is the mechanism and how can it be controlled?</em>

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Animal Behavior

<em>What is the mechanism that Ophiocordyceps unilateralis (Zombie fungus) uses to manipulate ants for its own disperal?</em>

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Parasitology

<em>Does the parasite Toxoplasma gondii induce erratic behaviors in humans?</em>

5 0
2 years ago
I REALLY NEED I JUST HAVE TO DO TWO MORE STUFF TO FINISH SCIENCE BUT I STILL NEED TO ALGEBRA I HAVE UNTIL FRIDAY TO FINISH SCIEN
ludmilkaskok [199]
We know that oil floats on water and do not mix
<span>
What happens to the oil when you first pour it in? It flows into the water, but then seperates.

Why does this happen? oil is lighter than water and the molecules of the oil are attracted to the other oil molecules, not water, the water molecules the same

What kinds of animals would be most affected by an oil spill at the beginning? animals that live their lives near the surface of the ocean. Why? because now the water that was clear and free-flowing is now dark and sticky. oil also changes the way how some animals survive so make their ways less effective. one example are birds like pelicans

Use a spoon to stir the oil for 30 seconds.


Answer the following questions:
What natural action stirs the real ocean? ocean currents caused by wind and the earth's roation
What happened to the oil? went back to the top
Even if you can’t see it, is all the oil still in your ocean? yes
Which animals in the ocean become affected after wave and current action causes some of the oil to settle to the bottom, or be absorbed into the water?  bottom-feeders
Add a splash of dish detergent to the mixture and stir.


Answer the following questions:
What happened to the oil? it mixed with the water Is it all still in the ocean? yes
Sometimes cleanup efforts involve dumping a soap mixture over a spill area. Why is this done? to bond the oil to the detergent and the detergent to the water. so they can grab all the oil
What might be a negative effect of dumping the soap?</span> soap has chemicals that could upset the ballance of the ecosystem and kil some animals/plants

5 0
3 years ago
Structure A is a _____.
Nookie1986 [14]

Answer:

solute

Explanation:

The cell membrane with an integral molecule that consists of two similar parts with a specific recess. There are many particles in the extracellular fluid. One of these particles is labeled A.

Structure A is a solute

Solute refers to the component which is dissolved in the solvent.

The solvent is the substance in which the solute is dissolved.

7 0
2 years ago
What is the role of b cells in the human immune system
Natasha_Volkova [10]
B cells mature in the bone marrow, which is at the core of most bones It recognises invaders by the shape of molecules -antigens- on their surfaces. With the help of T cells, B cells make proteins called antibodies. The antibodies will help your body become aware of intruders.
4 0
3 years ago
What are roles of producers, consumers, and decomposers in an ecosystem​
Daniel [21]
An organism that obtains energy and nutrients by feeding on other organisms or their remains. A food web is a model of the feeding relationships between many different consumers and producers in an ecosystem. Without plants (the primary producers) consumers and decomposers would not be able to live. Producers always start every food chain. A consumer, also called a heterotroph, is an organism that cannot make its own food. It must eat producers or other organisms for energy.
5 0
3 years ago
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