Ecology Crossword

2. include algae.
4. are the first producers of energy-rich compounds that are later used by other organisms.
7. show the relative amount of energy or matter contained within each trophic level in a given food chain or food web.
11. only a small portion of the energy that passes through any given trophic level is ultimately stored in the bodies of organisms at the next level.
12. is a series of steps in which organisms transfer energy by eating and being eaten.
14. are animals whose diets usually include both plants and animals.
17. feed by chemically breaking down organic matter.
18. feed on detritus particles.
20. are organisms that rely on other organisms for energy and nutrients.
21. the scientific study of interactions among organisms and their physical environment.
22. is the use of chemical energy to produce carbohydrates.

1. is any living part of the environment with which an organism might interact.
3. shows the relative number of individual organisms at each trophic level in an ecosystem.
5. obtain energy and nutrients by eating plant leaves, roots, seeds, or fruits.
6. captures light energy and uses it to power chemical reactions that convert carbon dioxide and water into oxygen and energy-rich carbohydrates.
8. kill and eat other animals.
9. is any nonliving part of the environment.
10. the total amount of living tissue within a given trophic level.
13. include Krill.
15. consume the carcasses of other animals that have been killed by predators or have died of other causes.
16. have feeding relationships that are much more complicated.
19. can capture energy from sunlight or chemicals and convert it into forms that living cells can use.