Answer: 1. - Major ecological grouping of plants and animals.
2. - The change of a substance from a gas to a liquid.
3. - An organism that eats food made by another organism.
4. - An organism which breaks down dead matter into chemical nutrients.
5. - The change of a substance from a liquid to a gas.
6. - A series of steps that illustrates the flow of energy from one organism to the next.