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Natural Selection

Natural Selection & Competition

Theory of Natural Selection Organisms best adapted to the environment will survive and reproduce.
competition when 2 or more organisms struggle for resources like food, space, water, and mates
resource what an organism needs to survive. Examples: water, food, shelter
species organisms that share most of the same traits and can reproduce fertile offspring
population all individuals of one species living in one area
fossil any remains or trace of past life, many fossils are shown in sedimentary rock
extinct when all members of a species have died and no longer exist on earth
Common Ancestor An ancestor (past relative) that two or more species have in common.
descendant something that has come down; your children and grandchildren are your descendants
contribute help to cause; Example: An enormous change in the environment could contribute to the extinction of a species.
pesticide a chemical spray that kills pests or insects
resistant the natural or genetic ability of an organism to avoid being killed by agents such as antibiotics or pesticides
Created by: rhk9teachermiron
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