The cell structure responsible for maintaining the environment of the cytoplasm is the A. cell wall.
B. cell membrane.
C. chloroplast.
D. mitochondria.
E. Golgi body.

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 .

During convection, less dense fluid rises and denser fluid sinks.

Identify the structures ! 20 points