Because nitrogen is a key component plants use to make chlorophyll and the key component in amino acids which make protein
I believe that the answer is b
Answer:
C
Explanation:
Constitute
be (a part) of a whole.
"single parents constitute a great proportion of the poor"
E. coli bacteria would not have a well defined nucleus, because bacteria are prokaryotic cells.
The onion cell and the human brain cell would be eukaryotic cells, which do have nuclei.
Answer:
Enzymes, special kinds of proteins, move up the ladder, breaking the rungs.
Explanation: