15.2 Organisms act in different ways.

Lesson Vocabulary:
predator, prey, competition, cooperation, symbiosis, mutualism, commensalism, parasitism

15.2 Review
1. compete for mates, cooperate for resources
2. compete, cooperate, or form symbiotic relationships
3. Sample answer: mutualism- bee and flower; commensalism- fish and jellyfish; parasitism- tapeworms in humans
4. Sample answer: Bittersweet competes with trees for space and sunlight, and has stunted their growth.
5. In a predator-prey relationship, one species benefits and the other is harmed. Parisitism is similar, but the effect is more dramatic because the parasite relies on its host for survival.
6. Sample answer: Tropical rainforests and coral reefs have many moe species than other ecosystems; more opportunities for mutualism.