graph the number of organisms of each age, similar to a survivorship curve; can be used to determine if a population size is growing, shrinking, or is constant all the living organisms that interact in an area a measure of a species' ability to resist changes in the environment an organisms ecological role or job in the community the environmental conditions in which an organism lives competition within a population of the same species for resources competition between different species for resources states that only one species can exist in each niche in the community compete for a limited resource; not a good interaction for either organism one organism preys on another; good interaction for predator, bad for prey

1. age structure charts

graph the number of organisms of each age, similar to a survivorship curve; can be used to determine if a population size is growing, shrinking, or is constant

2. community

all the living organisms that interact in an area

3. tolerance

a measure of a species' ability to resist changes in the environment

4. niche

an organisms ecological role or job in the community

5. habitat

the environmental conditions in which an organism lives

6. intraspecific condition

competition within a population of the same species for resources

7. interspecific competition

competition between different species for resources

8. competitive exclusion principle

states that only one species can exist in each niche in the community

9. competition

compete for a limited resource; not a good interaction for either organism

10. predation

one organism preys on another; good interaction for predator, bad for prey