Answer:
option B is correct
Explanation:
the effect of external physical factor on cell division is clearly seen on in density dependent inhibition( a phenomenon in which crowded cell stop dividing)
Answer: Scientists say that energy can neither be created nor destroyed, so therefore it is impossible for there to be an energy crisis.
Explanation:
I'm pretty sure I'm right
Amino group, carboxyl group, hydrogen atom, and variable group (represented with R). The r-group is a side chain and amino acids are grouped together by their side chains. The product of these groupings may be hydrophobic or hydrophilic.