Answer:
I have absolutely no clue
Answer: I think it's B
Explanation: power activates the spring, making it bounce or jump then goes to a stop
I believe (not sure) that the answer is B, viruses must invade their host before being able to reproduce.
I remember seeing a diagram of the general life of a virus, and I remember seeing the virus sticking to a cell, merging in, and reproducing thereafter (sort of like a factory). Once again, I am not sure and the answer may as well be another one.