2.  Remember populations have interacting members a specific species.  Communities have interacting members of different species.  Think about your neighbor hood. You people, cats, dogs, birds etc. all living in the same community.

3.  An individual of one species, called the predator. It eats all or part of an individual of another species called prey.  Predation is a very important part of ecology. It tells how big or small a population could be and how each species live.

4.  Natural Selection favors the evolution if predator adaptations for finding, capturing and consuming prey.  Snakes for example have heat pits that sense prey without having to look at them.

5.  Survival depends on how well an organism captures food however it also depends on how well you can hide or avoid getting captured.

6.  Ways animals avoid being eaten.  Mimicry- where one species closely resembles another species.  Plants use sharp thorns, spines, sticky hairs and tough leaves.

7.  Interspecific competition- a type of interaction in which 2 or more species use the same limited resource. (lions, hyenas)

8.  Close, long term relationship between 2 organisms.  Parasitism, mutualism and commensalism.

9.  A relationship in which one individual is harmed while the other benefits.  It does not result in death of the host.  Tapeworms

10.  This is where both organisms benefit.  Pollination of plants by animals.

11.  One organism benefits but the other organism is neither hurt nor benefits.  Cattle egrets and Cape buffalo

12.  Species Richness- the number of species in the community.  Species Evenness- relative abundance of a species. This takes into account how common each species is in a community.  Simple count of the species of the community.

13.  Ecological succession- gradual, sequential re- growth of a community.  Primary succession- the development of a community in an area that has not supported life previously.  Secondary succession- sequential replacement of species that follows disruption of an existing community.