D is the answer to the problem
Explanation:
the most common gas in the atmosphere is nitrogen and oxygen followed by CO2 etc...
Answer:
A. cell membrane
B. lysosome or ribosome, could be either one lol
C. nucleus
D. rough ER
E. smooth ER
F. golgi apparatus
G. nucleolus
Charles Darwin is considered the father of modern biology, as he influenced more people than any other biologist. Also, evolution by natural selection is the most important part of biology.