19 terms

LIFE OVER TIME (UNIT 6)

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evolution
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.
variations
natural differences.
adaptation
an inherited characteristic that helps an organism survive and reproduce in its enviorment.
extinction
all members of a species have died.
fossils
remains or imprints of once-living organisms.
fossil record
all of the fossils that have ever been discovered make up the fossil record.
species
a group of organisms that are very closely related.
genus
includes similar species.
domain
represents the largest differences among organisms.
bacteria
made up of prokaryotes that usually have a cell wall, and reproduce by cell division.
archaea
made up of prokaryotes.
eukarya
made up of all eukaryotes.
animalia
contains multi-cellular organisms that lack cell walls. they are able to move, and have specialized sense organs.
plantae
consists of multi-cellular organisms that have cell walls, cannot move around, and make tehre own food.
protista
*called protists
are single-celled or simple multi-cellular organisms such as algae, protozoans, and slime molds.
fungi
get energy by absorbing materials and have cells with walls, but no chloroplasts.
dichotomous key
uses a series of paired statements to identify organisms.