Answer :
Choice A i think
Answer:
Oxygen.
Explanation:
Aerobic respiration occurs in the presence of oxygen.
Answer: flagella
Explanation: not sure but i believe it is
Answer:HIV attacks a specific type of immune system cell in the body. It's known as the CD4 helper cell or T cell. When HIV destroys this cell, it becomes harder for the body to fight off other infections. When HIV is left untreated, even a minor infection such as a cold can be much more severe.
Explanation:
Another pair of organisms are in the same genus
