Activity Evolution: a change in populations over successive generations. Complete an Evidence Summary Chart as a class. Identify one pro (positive) and one con (negative) argument for each area of evidence
in the graphic organizer and one example for each of the two areas you were assigned. Define the key terms related to each area of evidence. Evidence for Evolution Area:
Fossil Record Examples: mastodon, wooly mammoth, elephant Pro: rock formations in layers help to date the fossils, some complete remains Con: formed,
record is incomplete, fossils not always soft tissue rarely preserved Vocabulary: fossil body parts (bones, casts) preserved or petrified in rock or amber. Fossils youngest layers
oldest layers Fossils Amber (tree sap) fossilized rock fossilized rock
Frozen in ice/snow American mastodon (Mammut americanum) extinct Woolly mammoth (Mammuthus primigenius)
extinct African elephant (Loxodonta africana) Evidence from Fossil Record 35 million years 2 million years
present day Evidence for Evolution Area: Anatomy Examples: forelimb structures (bird, horse, human)
vestigial organs (pig toes, whale pelvis, human appendix) Pro: can study structures in present day and fossilized organisms Con: some incomplete records for fossils
Vocabulary: comparative anatomy study of the structures of different organisms. homologous parts body parts similar in structure or function or both. vestigial structure a body structure once useful in early forms of an organism but no longer functional.
Homologous Structure of a Forelimb walking flying swimming salamander crocodile bird
bat digging handling whale mole human Homologous Structure of a Forelimb
Ulna (forelimb bone) in 5 mammals Vestigial Structure in a Whale whale ancestor Orca (whale) Pelvic bone w/femur (leg bone)
Vestigial Structure in a Whale whale ancestor dolphin w/hind flippers Pelvic bone w/femur (leg bone)
Vestigial Structures Pig foot - outer toes are raised and are useless. Pig foot has four toes. Pig walks on inner two toes. Vestigial Structures in Humans
Vestigial Structures in Humans human appendix Vestigial Structures in Humans appendix in other mammals
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