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7th gr science ch 6

ch 6 the environment and change over time

TermDefinition
fossil record made up of all the fossils ever discovered on Earth
mold the impression of an organism in a rock
cast a fossil copy of an organism in a rock.
trace fossil the preserved evidence of the activity of an organism
geologic scale the chart that divides Earth's historyinto different time units
biological evolution the change over time in populations of related oranisms
extinctions occurs when the last individual organisms of a species dies
naturalist a person who studies plants and animals by observing them
variation a slight difference in an inherited trait of individual members 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 have the variation
adaptation an inherited trait that increases an organism's chance of surviving and reproducing in its environment
camouflage an adaptation that enables a species to blend in with its environment
mimicry the resemblance of one species to another
selective breeding the breeding of organisms for desired characteristics
comparative anatomy the study of similarities and differences among structures of living species
homologous structures body parts of organisms that are similar in structure and position but different in function
analogous structures body parts that perform a similar function but differ in structure
vestigial structure body parts that have lost their original function through evolution
embryology the science of the development of embryos from fertilization to birth
Created by: HOMSSeminar