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Science Crossword Puzzle

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CROSSWORD CLUE (DEFINITIONS)
ACROSS DOWN
1. The smallest unit of living matter that can function by itself.
4. A substance that dissolves other substances.
5. A particle with a negative charge.
7. The amount of electricity in an object that is caused by an excess or deficiency of electrons.
8. A substance that has mass and makes up all objects.
13. A force that opposes motion.
14. The cooperative relationship of two different species.
15. The ability of an organism to maintain a stable equilibrium.
2. The rate at which the position of an object changes.
3. A small piece of a substance that is made up of at least two atoms.
6. The center of an atom.
9. A living thing that is composed of one or more cells.
10. A tiny particle of matter that is the smallest piece of an element.
11. The physical matter and existence of an object.
12. A particle with a positive charge.

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