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Bio CH29

Biology CH29 Evolution

competition the struggle among living things to get their needs for life
evolution a change in the hereditary features of a group of organisms over time
extinct a life-form that no longer exists
fetile being able to reproduce by forming egg or sperm cells
fossil the remains of once-living things from ages past
natural selection the process in which something in a living thing’s surroundings determines if it will or will not survive to have offspring
new-world monkey those monkeys that have a tail that can grasp like a hand and nostrils that open upward
old-world monkey those monkeys that cannot grasp with their tail, if they have one, and whose nostrils open downward
primate mammals with eyes that face forward, a well-developed cerebrum, and thumbs that can be used for grasping
sedimentary rock rocks that form from layers of mud, sand, and other fine particles
species the smallest group of living things; a group of living things that can breed with others of the same species and form fertile offspring
variation a trait that makes an individual different from others of its species
vestigial structure a body part that no longer has a function