The short answer is that cells respond to the chemical environment in which they find themselves. The cells around them, the specific conditions, and feedback from the environment all create specific chemical cues that inform the cells to which genes should be expressed, and in what amounts. Chemicals include hormones, cytokines, general signaling molecules, such as cAMP, etc.
i literally hopped on google for this, lol.
i hope this helps though. :)
Answer:
d
Explanation:
because its food that i choke on
D. He controlled variables by studying one or two traits at a time
Answer:
D
Explanation:
If a group of organs working together is called an organ system, and there are about 11 major body systems including the nervous system, the nervour system must be an organ system.
