Why do plants need nitrogen? A. to make new cells
B. to make protein
C. for food
D. for energy
It is multiple choice and for a test please answer asap

Cells tend to have a relatively small and uniform size. why aren’t cells larger?

Vaccines are weakened forms of disease causing microorganisms, which are given to patients to prevent disease. after the vaccine is administered, the immune system responds by creating a(n) to recognize the a.) antibody, antibiotic b.) antigen, antibody c.)antibiotic, antibody d.)antibody, antigen

Which set of terms best describes a community of miners who live out in the countryside of west virginia and use specialized geological equipment to analyze the composition of rock?