Movement of molecules from an area where there are many to an area where there are few

What elements have 2 electrons inthe 4s sublevel

Afamily is one another name for a group on the table of elements.

An animal cell loses the ability to convert energy stored in food to energy that the cell can use. which of the cell's organelles has stopped working? a.the mitochondria b.the nucleus c.the vacuoles d.the endoplasmic reticulum