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Science Maddie

life science chapter 5

Species A group of similar organisms that can mate and reproduce fertile offspring.
Adaption A trait that helps an organism survive and reproduce.
Evolution The gradual change in species over time.
Scientific Theory A well-tested concept that explains a wide range of observations.
Artifical Selection Man-made reproductions to get the offspring to your needs.
Natural Selection Nature lets species reproduce over time....4 step process.
Overproduction Most species produce far more offspring than can possibly survive.
Competition The offspring fight to survive.
Variation Any difference between individuals of the same species.
Selection Mother nature decides who lives and who dies.
Geologic Isolation The littlest scale...happens by a mountain chain.
Continental Drift The movement of the Earth's continents relative to each other.
Fossil The preserved remains or traces of an organism that lived in the past.
Sedimentary Rock The type of rock that only preserves fossils.
Petrified Fossil Minerals that replace bones over time.
Cast & Mold Type of petrified fossil that comes in pairs.
Preserved Remains A fossil that still has organic materials.
Extinct A whole species that dies out.
Relative Dating Using common knowledge to find out the age of a fossil.
Abosolute Dating Finding the exact age of a fossil.
Fossil Record A book/catalog of every fossil ever dug up.
Geologic Time Scale A time line of every species on Earth.
Gradualism Evolution appears slowly but steadily.
Punctuated Equilibria Evolution that occurs short periods of nothing but all of a sudden a big change.
Branching Tree A diagram that shows the realtionship between organisms.
Embryo Any organism before it hatches, is born, or germinates.
Homologous Structures Body parts that are structuraly similar in related species.
Created by: maddierawr