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19 Cards in this Set

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endangered species

one whose numbers are so low that they are in danger of becoming extinct


sedimentary rock

rock type formede by mud,sand,or other finr particles that settle out of liquid


primates

a group of mammles in which monkeys, apes. and humans belong to


natural selection
Darwin's theory that organisms best adapted with traits for an enviroment will survive to pass on those traits to their offspring


relative dating

method of dating fossils that can only estimate the age of fossils


hominids

humanlike primates that eat both meat and vegetables and walk upright on two feet


population

a group of organisms of one species that live in an area


vestigal structures

body part that is reduced in size and doesn't seem to have function


embryology


study of the development of embroyos


radioactive elements

elements whose atoms give off radiation, a form of atomic energy


gradualism

the model that describes evolution as a slow change of one species to another new species


species

a group of organisms whose members look alike and successfully reproduce among themselves


fossils


any remains of life from an earlier time


extintion


dying out of a species


evolution

change in the hereditary features of a species over time


variation
an apperance of an inherited trait that makes an individual different from other members of the same species


Homo sapien

a hominid primate mammal our own species or "wise human"


homologous

body parts that are similar in origin and structure


punctuated equilibrium

a model that shows rapid evolution of species comes about by the mutation of a few genes