Science

7. Gasoline is highly flammable.
9. The practice of growing a single crop or raising one type of animal in an area, often reducing biodiversity.
11. method A step-by-step process scientists use to ask questions, form hypotheses, conduct experiments, and analyze data.
12. A non-native species that spreads rapidly and harms native species and ecosystems.
13. An educated guess or prediction that you can test through an experiment.
15. degradation The process by which a natural habitat becomes unable to support the species present, often due to pollution, deforestation, or development.
17. The role an organism plays in its environment, including what it eats, where it lives, and how it interacts with others.
18. A rock is denser than a sponge.

1. variable The part of the experiment that you measure; it changes in response to the independent variable.
2. The ability of a substance to catch fire and burn.
3. The group in an experiment that does not get the independent variable; used for comparison.
4. A measure used to show data per person (e.g., per capita resource use).
5. The ability of a substance to dissolve in another substance (usually a
6. A species that has a large impact on its ecosystem; if removed, the ecosystem may change drastically.
8. The variety of life in a particular ecosystem or on Earth as a whole.
10. The amount of mass in a given volume (mass ÷ volume).
14. Sugar dissolving in water.
16. variable The part of the experiment that you change on purpose to test its effect.