Science

9. a group of populations of living things and the nonliving parts of their environment that support them
10. a group of living things that share traits and can breed successfully with each other, but not with other groups
12. the removal of rock material by wind, water, ice, or gravity
14. the process of using energy from the sun and matter from the environment to produce sugars that store energy in chemical bonds
15. the state of matter in which atoms or molecules are closely packed and touching one another but are not held in fixed positions
17. an individual particle of an element

1. the number of wave cycles that pass a certain point in a given period of time; often expressed in wave cycles per second
2. a random change to an organism’s DNA
3. a small rocky or metallic object that revolves around the sun
4. a collection of stars, dust, and gases held together by gravitational forces
5. the ability to move objects or cause a change
6. Earth’s thin, cool, and rigid outermost rock layer
7. a gigantic explosion of a large star
8. a solid structure whose atoms or molecules are arranged in a repeating, 3D pattern
11. the process by which water falls to the ground from clouds in the atmosphere in the form of rain, sleet, snow, or hail
13. the preserved remains or traces of a once-living organism
16. a disturbance that carries energy, but not matter, from one place to another