Nitrogen fixation is carried out by?
A. Plants
B. Animals
C. Humans
D. bacteria

What are the doorways into and out of cells, attached to the membrane, and built in the rough er.

Jane is blood type a her husband is blood type b. jane is puzzled because their daughter is type o. explain how the daughter inherited a blood type that neither of her parents had explain your answer

Guard cells control which event? the growth of plants capture of solar energy gas exchange in leaves water absorption in roots