Habitat
Ecosystem
Biotic Factors
Abiotic Factors
Population
Ecology
Population Density
Birth Rate
Death Rate
Immigration
Moving into a population
Emigration
Leaving a population
Limiting Factor
Natural Selection
Adaptations
Niche
Competition
Predation
an interaction in which one organism kills and eats another
Predator
Prey
Symbiosis
Mutualism
Commensalism
Parasitism
Parasite
Host