I think it is D because your responding to the cold from stimuli and by creating heat to keep your body the average temperature it is homeostasis.
Answer:
A. movement of molecules across a semipermeable membrane against a concentration gradient with a protein
Answer:The second one im sure
Explanation:
D) take in nutrients because endocytosis is the process when a cell takes in food
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Oxygen will diffuse from an area of higher concentration (outside the cell) to an area of lower concentration (inside the cell). </span>
