How many elements occur naturally on Earth?

Atoms contain all of the following, except...

Electrically charged atoms are called ________.

Two substances mixed together can form any of the following EXCEPT ________.

Enzymes are a kind of ________ that speed up chemical reactions without being changed.

Molecules move into and out of a cell through the ________.

The net movement of molecules from an area where there are many to an area where there are few is called ________.

Osmosis is the diffusion of ________ through a cell membrane in order to establish an equilibrium of solutes.

Of the following, which is NOT a method of transporting materials into a cell?

________ is the total of all chemical activities of an organism that enable it to stay alive, grow, and reproduce.

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