Across
- 1. an animal that is hunted and killed by another for food.
- 3. an animal that naturally preys on others.
- 6. symbiosis that is beneficial to both organisms involved.
- 7. interaction between two different organisms living in close physical association, typically to the advantage of both.
- 8. physical rather than biological; not derived from living organisms.
Down
- 1. the practice of living as a parasite in or on another organism.
- 2. association between two organisms in which one benefits and the other derives neither benefit nor harm.
- 4. interaction between organisms, populations, or species, in which birth, growth and death depend on gaining a share of a limited environmental resource.
- 5. relating to or resulting from living things, especially in their ecological relations.
- 9. tending to spread prolifically and undesirably or harmfully.