2/14 - 7th Grade Agenda Collect HW: Homologous Structures

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Presentation transcript:

2/14 - 7th Grade Agenda Collect HW: Homologous Structures Late Science Fair Procedure Data table & Graphs Presentations Text Book Reading: 244 – 246 HW: Reading & Notetaking p. 123 – 124 Reminder: Science Fair Project Due 2/22 & 2/23 (50 Points)

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

Can evolution be described as a tree or a ladder?

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 prints Megalosaurus 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? 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