Ecosystems

4. an animal that has the ability to eat and survive on both plant and animal matter
5. a barren area of landscape where little precipitation occurs
9. exist in waters that have a high salt content
12. a living organism that shapes its environment
13. the study of the relationships between living organisms, including humans, and their physical environment
14. surroundings or conditions in which a person, animal, or plant lives or operates
16. lakes, ponds, rivers, streams, springs, bogs, and wetlands
18. includes microorganisms such as yeasts and molds, as well as the more familiar mushrooms

1. is the process by which an entire body of water, or parts of it, becomes progressively enriched with minerals and nutrients
2. can include water, light, radiation, temperature, humidity, atmosphere, acidity, and soil
3. "falling off at maturity"
6. adapted to eating plant material, for example foliage or marine algae, for the main component of its diet
7. meaning "meat eater"
8. is an ecosystem in and surrounding a body of water, in contrast to land-based terrestrial ecosystems
10. a partially enclosed, coastal water body where freshwater from rivers and streams mixes with salt water from the ocean
11. moral philosophy movement focused on protecting species from extinction
15. a large naturally occurring community of flora and fauna occupying a major habitat, e.g. forest or tundra
17. consists of all the organisms and the physical environment with which they interact