Answer:
present
Explanation:
Otherwise the only similarity is that they are organelles, and can generate themselves.
The answer is D its tightly packed cells allow for proctection against harmful substances.
Answer:
Viruses cannot reproduce on their own, but inject their DNA into living cells in order to make copies of themselves.
Explanation:
A virus cannot reproduce itself outside the host because it lacks the complicated machinery that a [host] cell possesses.
The substrate is the part that sticks into the active site of an enzyme.
