1. Organism Habitat Biotic Factor Abiotic Factor Photosynthesis
A living thing
Habitat
The specific environment that provides the things an organism needs to live, grow and reproduce
Biotic Factor
A living part of an organism’s habitat
Abiotic Factor
A nonliving part of an organism’s habitat
Photosynthesis
The process where some organisms use water and carbon dioxide, with light to make food

2. Species Population Community Ecosystem Ecology
A group of organisms that are physically similar, can mate and produce fertile offspring
Population
All the members of one species in a particular area
Community
All the different populations that live together in a area
Ecosystem
The community of organisms that live in a particular area along with their nonliving surroundings
Ecology
The study of how organisms react with their environment

3. Estimate Birth Rate Death Rate Immigration Emigration
An approximation of a number, base on reasonable assumptions
Birth Rate
The number of births in a population in a certain amount of time
Death Rate
The number of deaths in a population in a certain amount of time
Immigration
Moving into a population
Emigration
Leaving a population

4. Population Density Limiting Factor Carrying Capacity Natural Selection
The number of individuals in a area of a specific size
Limiting Factor
An environmental factor that prevents a population from increasing in size
Carrying Capacity
The largest population that an area can support
Natural Selection
A process where individuals that are better adapted to their environment are more likely to survive than others
Adaptations
A behavior or physical characteristic that allows an organism to survive or reproduce in its environment

5. Niche Competition Predation Predator Prey
The role of an organism in its environment or how it makes its living
Competition
The struggle between organisms to survive as they attempt to use the same limited resource
Predation
An interaction where one organism kills another for food
Predator
The organism that does the killing in a predation interaction
Prey
An organism that is killed and eaten by another organism

6. Symbiosis Mutualism Parasitism Parasite Commensalism
A close relationship between two organisms of different species that benefits at least one of the organisms
Mutualism
A close relationship between two organisms of different species in which both organisms benefit
Commensalism
A close relationship between two organisms of different species where one benefits and the other is neither helped nor harmed
Parasitism
A relationship in which one organism lives on or in a host and harms it
Parasite
The organism that benefits by living on or in a host in a parasitic relationship

7. Host Succession Primary Succession Pioneer Species
The organism that a parasite or virus lives on or in
Succession
The series of predictable changes that occur in a community over time
Primary Succession
The series of changes that occur in an areas where no soil or organisms exist
Pioneer Species
The first species to populate an area
Secondary Succession
The series of changes that occur in an area where the ecosystem has been disturbed but soil and organisms still exist