Environment.
Whatever surrounds the organism being studied is the environment as the environment factors in to how organisms react and behave.
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Answer:
The correct answer is environment.
Explanation:
Every living thing, or organism, thrives in an environment. The environment of an organism comprises everything that surrounds it. Water, air, soil, and sunlight are all the constituents of the environment. The environment offers each and every organism with each and everything that it requires to survive.
