According to scientific thought, when does one species of organisms become two species?

a.
when one population becomes extinct

b.
when populations compete for the same resources

c.
when populations become separated from one another

d.
when one population cannot interbreed with the other population

Which of the following statements best explains the relationship between medicines and concerns about the shrinking of the amazon rainforest?

St. louis, missouri, and san francisco, california, both lie around 33° north latitude. st. louis is inland, while san francisco is on the coast of the pacific ocean. which statement about these north american cities would be true? san francisco will be warmer than st. louis in the winter. san francisco and st. louis will be about the same temperature year round. san francisco will be warmer than st. louis in the summer. san francisco will be warmer than st. louis year round.

Why do so many children develop illnesses in southern africa? a. poor nutrition due to poverty c. very bad air pollution b. climate many diseases thrive d. declining life expectancy