Although all the body cells in an animal contain the same hereditary information, they do not all look and function the same way. which step of differentiation causes this to occur?

Ecologist have observed a sharp increase of sulfur dioxide in the air . what might be a possible consequence of excessive sulfur dioxide in the air ? a. acid rain b. ozone layer depletion c.ozone layer hole d.increase in sea levels

Up to what percentage of the world's flora consisted of cycads during the triassic period? 100% 75% 50% 20%

Does all the energy stored by the phytoplankton reach the top level of the pyramid