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Change Over Time

This section introduces students to the theory of evolution. Thye will see how organisms change at the population level through adaptations. Students will learn about the evidence of evolution, including the fossil record and comparisons of organisms' phy
by

Robert Williford

on 13 January 2014

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Transcript of Change Over Time

In this section we will discuss how organisms change over time, what the term evolution means, and what evidence there is to support it.
Differences Among Organisms
Do Species Change over Time?
Evidence of Evolution: The Fossil Record
Case Study: Evolution of the Whale
Comparing Skeletal Structures and embryonic Structures
Adaptation -
a characteristic that helps an organism survive and reproduce in it's environment.

Species -
a group of organisms that can mate with another to produce fertile offspring. For example, all red-eyed tree frogs are members of the same species and can mate with one another to produce more red-eyed tree frogs.
Evolution -
the process by which populations accumulate inherited changes over time.
Fossils -
the solidified remains or imprints of once living organisms.
Fossil Record -
supplies evidence about the order in which evolutionary changes have occurred.
Vestigal Structures -
remnants of once useful structures in organisms. Whales have the remnants of hind-limb bones inside their bodies even though they have no use for them now.
Change Over Time
Comparing DNA:
All living things share the same kind of genetic material suggesting a common ancestor. Organisms more closely related have more similarities in their DNA. Chimpanzees and Gorillas have very similar DNA. Chimps and Toucans do not.
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