Many viruses that infect humans may illicit a strong immune response causing additional harmful effects, so the discovery of a virus that can induce an immune response without causing harm made it attractive for vaccine development.

A. True
B. False

well, you see. the answer to your question is quite simple. the thing that is big, powerful, and over 9,000 is your mom.

they both go up but then go back down. they both end lower than they started. lastly, they both are competitive/the second on.

explanation:

the answer is true when observing or determining population size, a direct observation is use, in which each organism is counted in a population or in an area. one benefit of this measure is that you get the exact population count but it will take a long time to  determine  the  size  of a  population.