The theory of
explains how new crust is created at mid-ocean ridges.

the animal that would be cutest if scaled down to the size of a cat? elephant

b ti isnfornopgnoernfrof

unicellular organisms, like bacteria, are able to perform all life functions within one single cell. multicellular organisms need many different types of cells to carry out the same life processes. each of these special types of cells has a different structure that it perform a specific function.