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19 Cards in this Set

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  • Back

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


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


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


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


study of the development of embroyos

radioactive elements

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


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


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


any remains of life from an earlier time


dying out of a species


change in the hereditary features of a species over time

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"


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