Ecology and Classification

3. A feature or behavior that helps an organism survive in its environment.
5. A complex network of interconnected food chains in an ecosystem.
6. The ability to do work, often transferred through food chains.
9. Organisms that break down dead material, recycling nutrients.
13. The natural environment where an organism lives.
15. An organism that eats plants.
17. A substance that provides nourishment essential for growth and maintenance of life.
18. A group of organisms capable of interbreeding and producing fertile offspring.

1. An animal that hunts other animals for food.
2. The variety of life forms in a particular habitat or ecosystem.
4. An organism that eats other animals.
7. A system of interacting organisms and their environment.
8. All the organisms of the same species in a given area.
10. The long-term weather conditions in a particular area.
11. A sequence of organisms, each dependent on the next as a source of food.
12. Organisms that make their own food, often plants.
14. An animal that is hunted and eaten by a predator.
16. Organisms that obtain energy by eating other organisms.