Two species of frogs mate with each other. the embryo dies after a few cell divisions. what kind of reproductive isolation does this example represent? temporal isolation mechanical isolation postzygotic isolation gametic isolation

postizygot isolation

significant amounts of nitrogen oxides, carbon monoxide, and other pollution

explanation:

passenger vehicles are a major pollution contributor, producing significant amounts of nitrogen oxides, carbon monoxide, and other pollution. in 2013, transportation contributed more than half of the carbon monoxide and nitrogen oxides, and almost a quarter of the hydrocarbons emitted into our air.

i think the miocene epoch spans the time from 23 million to 12 million years ago.