Except for germs like viruses and bacteria, just about every other
living thing on Earth is made of cells. This is probably why cells are
called the building blocks of life.
All human body cells are covered by a membrane. This layer
holds the contents of the cell in just like the sides of a container. The
membrane lets good things, like nutrients, into the cell. It also keeps
bad things, like germs and bacteria, out.
+JLY
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Topic: Cells of the Body (Read 1179 times)