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science chp6 less1

chapter 6 lesson 1 vocab

TermDefinition
fossil record is made up of all the fossils ever discovered on earth.
mold the impression of an organism in a rock
cast a fossil cops of an organism in a rock
trace fossils the preserved evidence of the activity of an organism
geologic time scale a chart that divides earth's history into different time units
extinction when the last individual organism of a species dies.
biological evolution the change over time in populations of related organisms.
naturalist a person who studies plants and animals by observing them
variation a slight difference in an inherited trait individual member of a species.
natural selection the process by which populations of organisms with variations that help them survive in their environments live longer, compete better, and reproduce more than those that do not the variations.
adaptation an inherited trait that increases an organism's chance of surviving and reproducing in its environments.
camouflage an adaptation enables a species to blend with its environment.
mimicry the resemblance of one species to another species.
selective breeding the breeding of organisms for desired characteristics
comparative anatomy the study of similarities and differences among structures of living species.
homologous structure body parts of organisms that are similar in structure and position but different in function.
analogous structure body parts that perform similar function but differ in structure
vestigial structure body parts that have lost their original function through evolution.
embryology the science of development of embryos from fertilization to birth
Created by: gkeren
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