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2. - An individual living thing, composed of one or many cells
4. - A functional unit in an organism that carries out a particular role, made of cells that coordinate their function
6. -The way things really are; the whole of reality
7. - a small part of the cell that carries out a specific function
9. - The fundamental unit of matter, composed of protons, neutrons and electrons.
13. - All living things on earth
14. of scientific enterprise - the process of forming a theory to account for a body of facts, formulating testable hypotheses from that theory, testing the hypothesis experimentally and then analyzing the results. If the hypothesis is supported by the experimental result, the theory is strengthened, otherwise the theory is weakened.
15. - A testable, informed prediction, based on a theory, of what will happen under certain circumstances
16. - A quasi-fluid substance that surrounds cells or organelles, allowing the passage of some molecules but not others
18. - The central organelle of the cell, bound by a perforated double membrane, and containing DNA, the nucleolus, and ribosomes
19. - A statement, backed up by evidence, that is correct from what we know
20. - Too small to be seen without the aid of a microscope

1. - A single species living in a particular geographical region at the same time
3. - The organelle where ATP synthesis occurs
5. number - The number found on the periodic table for each element, indicating the number of protons the element has.
8. - A scientific test of a hypothesis
10. - The best model or explanation we have at a present for a body of facts, providing the means for producing new hypotheses
11. - A microscopic, membrane-bound entity that possesses genetic material, cycles matter and flows energy, is composed of biomolecules, and contains cytoplasm.
12. - A group of cells of the same type that work together to perform a specific function
17. - An instrument used to visualize entities that are too small to be seem