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the process in which populations gradually change overtime.

artificial selection

the practice by which humans select plants or animals for breeding based on desired traits.

natural selection

is the process by which organisms that inherit advantageous traits tend to reproduce more successfully that other organisms do.


natural differences.


an inherited characteristic that helps an organism survive and reproduce in its enviorment.


all members of a species have died.


remains or imprints of once-living organisms.

fossil record

all of the fossils that have ever been discovered make up the fossil record.


a group of organisms that are very closely related.


includes similar species.


represents the largest differences among organisms.


made up of prokaryotes that usually have a cell wall, and reproduce by cell division.


made up of prokaryotes.


made up of all eukaryotes.


contains multi-cellular organisms that lack cell walls. they are able to move, and have specialized sense organs.


consists of multi-cellular organisms that have cell walls, cannot move around, and make tehre own food.


*called protists
are single-celled or simple multi-cellular organisms such as algae, protozoans, and slime molds.


get energy by absorbing materials and have cells with walls, but no chloroplasts.

dichotomous key

uses a series of paired statements to identify organisms.

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