Biology test

2. the action or fact of forming a united whole.
6. a group of organs working to do one task like the digestive system
7. all the inhabitants of a particular town, area, or country.
9. not consisting of or deriving from living matter.
11. the smallest structural and functional unit of an organism, typically microscopic and consisting of cytoplasm and a nucleus enclosed in a membrane.
13. a group of atoms bonded together
15. a chemical substance that neutralizes alkalis, dissolves some metals, and turns litmus red; typically, a corrosive or sour-tasting liquid of this kind.
18. a particle smaller than an atom
19. any of the distinct types of material of which animals or plants are made, consisting of specialized cells and their products.
20. able to dissolve other substances.

1. a molecule containing a very large number of atoms, such as a protein, nucleic acid, or synthetic polymer.
3. a particular area or place considered together with its inhabitants.
4. an individual animal, plant, or single-celled life form.
5. a biological community of interacting organisms and their physical environment.
8. relating to or derived from living matter.
10. the action or process of adhering to a surface or object.
12. the regions of the surface, atmosphere, and hydrosphere of the earth (or analogous parts of other planets) occupied by living organisms.
14. a part of an organism that is typically self-contained and has a specific vital function, such as the heart or liver in humans.
16. a main or important element or ingredient to which other things are added.
17. an extremely small amount of a thing or quality.