bio chapter 16

the process by which species change over time.

a broad explanation that has been scientifically tested & supported.

when Darwin presented evidence that evolution happens & offered an explanation of how evolution happens.

evidence of evolution at work.

descendants were modified over time as different groups survived by eating different types of food. this key idea was a key part of his theory.

breeders take advantage of natural variation in traits within a species.

selection is done by humans & not by natural causes.

ideas from the fields of natural history, economics, and geology. the ideas of Lamrack, Malthus, Cuvier, & Lyell were especially important.

He proposed, like Darwin, that organisms change over time as they adapt to changing environments. however he had an incorrect idea that changes due to use or disuse of a characteristic would be passed on to offspring.

population was increasing more then the food supply.food supply was increasing linearly- increased by same amount each year.human population was increasing exponentially- more people were added each year than were added then the year before.

Darwin saw that all kinds of organisms tend to produce more offspring than can survive. So, all populations must be limited by their environments.

the study of rocks & landforms