How does the cell move materials across its membrane in order to keep its internal environment constant?

Water, carbon dioxide, and oxygen are among the few simple molecules that can cross the cell membrane by diffusion (or a type of diffusion known as osmosis ). Diffusion is one principle method of movement of substances within cells, as well as the method for essential small molecules to cross the cell membrane

i'd say that the moon rock is about 2.2 billion years old.