Insulin, a hydrophilic compound, binds to a site on the cell's extracellular surface, causing activation of a second messenger system on the cell's interior.

answer; polycythemia is the correct answer;

the "dirty dozen" chemicals banned in an international treaty are formally known as persistent organic pollutants, or pops. the united nations environment program provided this background on what they are and what they can do to humans and wildlife.

i hope this

actually the answer is c

because photosynthesis could not occur (apex)