How do thick and fleshy leaves of Aloe vera help in adaptation

Most animal cells membranes have proteins that pump ions out of the cell and potassium ions into the cell

In many humans, exposing the skin to sunlight over prolonged periods of time results in the production of more pigment by the skin cells (tanning). this change in skin color provides evidence that -

At which point is crust neither created nor destroyed? island chain mid-ocean ridge divergent boundary transform boundary