Answer:
Diffusion is a net movement of molecules or ions from a region of higher concentration to a region of lower concentration down a concentration gradient at a random movement.
So food molecules to move into the blood stream because blood is a region that has a lower concentration of molecules.
The answer would be D)hormones
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Answer:
Keratin serves important structural and protective functions, particularly in the epithelium. Some keratins have also been found to regulate key cellular activities, such as cell growth and protein synthesis
