How does the structure of animal cells allow animals to move?

Why are scientists concerned about the depletion of the ozone levels in the stratosphere?

Can bacteria reproduce in a way such that when you start out with two bacteria, you get five bacteria? why or why not? * a. yes, because bacteria reproduce sexually, and can produce any number of offspring, just as humans do. b. no, because bacteria grow at an exponential rate. c. no, because when bacteria reproduce, they split into two parts, and two bacteria splitting would result in four bacteria.

Explain what a zygote is. use the terms egg cell, sperm cell, and fertilization in your explanation.