Describe two serious threats to our supply of groundwater.

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.

Math focus 4. calculate a map has index contours at 250 m, 500 m, and 750 m. what is the contour interval?

24. how are vaccines used to keep people healthy?