Fossil evidence tells us that many new species will be evolving. many species that once lived no longer live. the future of specific species is questionable. all species that ever existed are still alive.

The answer is B. "Many species that once lived no longer live". In fact, scientists have estimated that over 99 percent of all species that has ever existed on earth have gone extinct, many during the 5 massive global extinctions.

A. They must be excreted from the cell.

Explanation:

Respiration is a process in which energy is released due to the breakdown of glucose molecules with the addition of oxygen forming carbondioxode, water and energy in the form of ATP. This energy is used by the cell in different processes and activities. Water and carbondioxide is a waste product which is removed from the cell during breathing of organisms.