EVOLUTION SUMMATIVE

NATURAL SELECTION

• An organism has a variation
• The variation provides an advantage in it's environment
• This allows the organism to survive and reproduce better
• It passes the trait onto it's offspring and eventually, the variation is spread through the population of the species

Overproduction
Overproduction is when an organism reproduces more offspring than can possibly survive to ensure that at least some of them will make it

Variation
A variation is a difference in the organisms in the same species
Example: different eye colors

Adaptation
An adaptation is a variation that provides the organism with an advantage in the environment

The theory of evolution is not "just a theory." A scientific theory is well supported by facts and evidence and only changes very slightly. These next slides all support the theory of evolution.

FOSSILS

• Get information about where species used to live
• Shows how organisms looked
• Can compare with similar organisms and see how they evolved
• Fills in the fossil record and provides new information

SIMILAR STRUCTURE

• Example: bats and humans have similar arm bone structure
• Points to common ancestors
• Shows how organisms split off from their ancestors and evolved, but still have something's in common

GENETICS

• Example: humans and chimpanzees have 98% of their genome in common
• Says how closely organisms are related
• Shows about how recently different species split off and speciated