"Which best defines homeostasis? A. Modifying the external environment B. Maintaining a stable internal environment C. Controlling what enters and exits the cell D. Movement of materials into the cell"
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Answer

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Step 1
: Identify the correct definition of homeostasis.

Homeostasis refers to the ability of an organism to maintain a stable internal environment, despite changes in external conditions. This concept is fundamental in biology and is often associated with the regulation of various physiological parameters, such as temperature, pH, and osmotic pressure.

Step 2
: Eliminate incorrect answer choices.

(A) Modifying the external environment is not the best definition of homeostasis. Instead, homeostasis focuses on maintaining a stable internal environment, even when the external environment changes. (C) Controlling what enters and exits the cell is related to the cell membrane's function but does not fully capture the concept of homeostasis, which involves maintaining a stable internal environment for the entire organism. (D) Movement of materials into the cell is also related to the cell membrane's function but does not encompass the broader concept of homeostasis.

Final Answer

The correct answer is (B) Maintaining a stable internal environment.

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