*Natural selection- best suited characteristics survive and are passed to offspring

*Niche- Role of an organism in its environment

*Struggle between organisms to survive as they attempt to use the same resources

*Interaction in which one organism kills another for food

*Predator-does the killing, snake*Adaptations to help catch/kill prey like poison,

speed, echolocation

*Prey-is killed, mouse*Adaptations to help escape predators like

mimicry, protective covering, false coloring, warning colors, camouflage

*Close relationship between 2 species that benefits at least 1 of the species*3 types of symbiosis

*Both species benefit*Lichen-algae and fungi*Clownfish and anemone*Cleaner fish and sharks

*One species benefits, the other is neither helped nor hurt*Red-tailed hawks build nests in saguaros

*One organism helped, the other is harmed*Parasite hurts its host*Fleas*Ticks*Tapeworms*Mites