Community Interactions Refer to Chapter 21 Section 3 Set 2 Vocabulary

Community Interactions Natural Selection Adaptations It works like this: If an individual organism has a characteristic that is best suited to the environment it will tend to survive and pass this trait on to it’s offspring. These characteristics are known as adaptations. They help the offspring survive so that this behavior or physical characteristic becomes common in the population.

Community Interactions – 3 types 1 - Competition: The struggle between organisms to survive as they attempt to use the same limited resource.

2- Predation: one organism kills another for food Predator = the killer Prey = the food

3 – Symbiosis: a close relationship between two species that benefits at least one species. 3 different types Mutualism Commensalism Parasitism

Mutualism: Both organisms benefit +, + Example: The Decorator Crab Covering itself with Anemones. Name the benefits…

Commensalism: One organism benefits; while the other neither helped or harmed. +, o

Parasitism: One organism benefits; while the other is harmed +, - The organism that is harmed is called a HOST http://www.pbs.org/wgbh/nova/nature/tongue-parasite.html