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Mr. Radeke

Mr. Radeke Chp.21 Sec.3 Life Science

QuestionAnswer
natural selection A process by which individuals that are better adapted to their environment are more likely to survive and reproduce than others of the same species.
adaptations A behavior or physical characteristic that allows an organism to survive or reproduce in its environment.
niche The role of an organism in its habitat, or how it makes it living
competition The struggle between organisms to survive as they attempt to use the same limited resources.
predation An interaction in which 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.
symbiosis A close relationship between two organisms of different species that benefits at least one of the organisms.
mutualism A close relationship between organisms of two species in which both organisms benefit.
commensalism A relationship between two species in which one species 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 parasitism interaction.
host The organism that a parasite or virus lives on or in.
Why can't two species occupy the same niche? If two species occupy the same niche, they will compete directly against each other and one species will eventually die off.
What are two predator adaptations? some can run fast; some produce poisons to paralyze or kill prey;some can see at night; some produce sound waves and interpret echoes.
Why doesn't a parasite usually kill its host? If a parasite kills its host, the parasite will no longer have a source of food.
What are three main ways in which organisms interact? Competition, predation, and symbiosis
List three types of symbiotic relationships. Mutualism, commensalism, and parasitism.
Created by: Tom Radeke
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