Answer:
Yes.
Explanation:
A virus is a dangerous cell. And cells are alive. The nucleus in the cell gives it it's "life" by controlling what the cell does at all times. The nucleus is like our brain or heart, you could say,
The answer is the third one
Energy input is required as it is the activation energy needed for a reaction to start.
Answer:
A) species with short reproductive cycles
Heart rate, color, irritability, muscle tone, and breathing
