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Glencoe Science Life Structures and Functions Chap 6 Vocab

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species
a group of organisms that share similar characteristics and can reproduce among themselves to produce fertile offspring
evolution
change in species
natural selection
survival of the fittest
varation
Any difference between individuals of the same species.
adaptation
a varation that makes an organism better suited to its enviroment
gradualism
model describing evolution as a slow process by which one species changes into a new species
punctuated equilibrium
model describing the rapid evolution that occurs when mutation of a few genes results in a species in a short period of time
sedimentary rock
a type of rock, such as limestone, that is most likely to contain fossils and is formed when layers of sand, silt, clay, or mud are cemented and compacted together or when minerals are deposited from a solution
radioactive element
element that gives off a steady amount of radiation as it slowly changes to a nonradioactive element
embryology
The study of embryos and thier development
homologous
body parts that are similar in structure and origin and can be similar in function
vestigial structure
structure, such as the human appendix, that doesn't seem to have a function and may once have functioned in the body of an ancestor
primates
group of mammals including humans, monkeys, and apes that share characteristics such as opposable thumbs, binocular vision, and flexible shoulders
hominid
humanlike primate that appeared about 4 million to 6 million years ago, ate both plants and meat, and walked upright on two legs
homo sapiens
early humans that likely evolved from Cro-Magnons