How does groundwater become polluted?
a.
pollutants mixed with water pass through permeable layers above the aquifer.
b.
factories dump their waste directly into aquifers.
c.
refuse infiltrates the water table when garbage is dumped.
d.
all of the above

Chloroplasts and bacteria are in size. a. similar b. at different ends of the size range c. exactly the same d. none of these

The image shows the evolution of a species of fish. a few fish from a population developed different social behaviors and evolved into different species. two fish according to the image, the fish underwent . the new species of fish had mating seasons that were different from that of the original fish. because of the differences in mating seasons, the fish underwent reproductive isolation. this mode of isolation would be .

In an hydrogen ion pump the energy is used to join small molecules together to make larger ones which factor most likely has the greatest effect on the number of molecules mitochondria can produce