2/21 & 2/22 - 7th Grade AgendaLearning Objective: Learn about evidence of evolutionCollect HW: Homologous StructuresScience Fair Check upPass back HW & TestVideo: PBS EvolutionText Book Reading: 244 – 246HW: Reading & Notetaking p. 123 – 124HW: Signed Grade PrintoutReminder Science Fair Board due 2/23 & 2/24 (50 Points)

Reflection

• Prompt: Why is it better to describe evolution as a tree instead of a ladder?

Science Fair Check up

Science Fair Project due 2/22 & 2/23 (50 Points)

Science Fair Project Due 2/23 & 2/24 (50 Points)

Title: 3 points

Question: 3 Points

Hypothesis : 3 Points

Background: 3 Points

Materials: 3 Points

Procedures: 3 Points

Data Table: 3 Points

Graph: 3 Points

Bibliography: 2 Points

Results: 3 points

Discussion: 3 Points

Conclusion : 3 Points

Display Decoration: 5 Challenging: 5 Points

Scientific Validity: 5

Results: 3 Points

• Results: The results should look for patt________ in your data and graphs. Describe the patterns in 2-5 sentences. Results are factual so DO NOT include opi_______ or reasoning.

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Discussion: 3 Points• Discussion: The discussion should be one or

more paragraphs. • Why do you think you got the re______ that

you did? • Explain possible err______ and problems that

occurred during your experiment? • How can your experiment be impr________? • What did you lea____ by doing this

experiment? (Be scientific…do not say, “I learned that growing plants was fun.”)

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Conclusion: 3 Points

• Conclusion: Restate your hypo________. Was your hypothesis supported or not supp_______? Explain why it was supported or why it was not (this should answer your initial question).

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Display Decoration: 5 Points

• Board must be 36 X 48 inches

• Is it Neat?

• Don’t forget about the decorations

• Make the Science Fair Board attractive with lots of drawing, decorations & photos

Challenging: 5 Points

• amount of time

• difficulty of the question and test

• quantity of trials/tests

• complexity of the experiment/experimental design

Scientific Validity: 5 Points

• accuracy of tests

• accuracy of scientific design

• controlled experiment

• One variable tested

• Other factors constant

• scientific measurement system

Reflection

• Prompt: Copy 1 paragraph of discussion from a science board.

Did humans evolve from chimpanzees?

• NO• Humans did not evolve from

chimpanzees. Humans and chimpanzees are evolutionary cousins and share a recent common ancestor that was neither chimpanzee nor human.

• Humans are not "higher" or "more evolved" than other living lineages.

Comparison of Bonobos and Chimpanzees

Bonobo Chimpanzee

Flores man was 3 feet tall

• Lived in an Island in Indonesia 10,000 years ago

• Lived with Dwarf Elephants

Gigantopithecus was 10 feet tall

• Lived in SouthEast Asia 100,000 years ago.

• Walked on all fours but can stand upright

Can evolution be described as a tree or a ladder?

• Tree

Fossils in which minerals replace all or part of an organism

is called…• Petrified Fossils

Most Common Fossils are Molds and Casts. What are they?

• Mold: Hollow in shape and are formed when an organism buried in sediment dissolves

• Cast: Copy of an organism’s shape formed when minerals seep into a mold

Dinosaur Foot Print

What is a carbon film fossil?

• Carbon film is an extremely thin coating of carbon on rock.

What are Trace Fossils?

• Trace Fossils provide evidence of the activities of ancient organisms. Such as Dinosaur foot printsMegalosaurus footprint A meat eating predator from the Jurassic

What are some of the ways that extinct animals can be preserved

with little or no change?• Tar• Amber• Freezing

The preserve remains or traces of an organism that lived in the

past is called…• Fossil• Most fossils form

when organism that die become buried in sediments

• Remains of most animals never becomes fossil

How do fossils form?

Gradualism vs Punctuated Equilibria

• Gradualism: The theory that evolution occurs slowly by steadily

• Punctuated Equilibria:Evolution occurs during short periods of rapid change separated by long periods of little or no change

What are homologous structures?

• Similar structures that related species have inherited from a common ancestor

Similarities in Early Development

Human Embryos have tails and gill slits

Similarities in DNA – Is an Elephant and this Shrew closely

related?• Scientists can

determine how closely related the species are by comparing the DNA of different species

• DNA comparison has revealed that the tiny elephant shrew is closely related to the elephant

Branching Tree shows how closely related species are