Biology 7

2. The basic structural and functional unit of all living things.
4. The study of organisms interacting with each other and their environment.
7. An organelle that releases energy from food; the "powerhouse" of the cell.
10. The smallest unit of an ecosystem that includes both living and non-living things.
11. An organism that makes its own food, like a plant.
12. The non-living components of an ecosystem.

1. An organism that feeds on dead organic matter.
3. The relationship where one organism benefits and the other is harmed.
5. The relationship where one organism benefits, and the other is neither harmed nor helped.
6. The living or once-living components of an ecosystem.
8. The "brain" of a cell that controls its activities.
9. The relationship where both organisms benefit.