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Science Letter Shapes

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

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