Evolution Arguments and Counter- arguments

Goals/Objectives I will identify the arguments for evolution. I will identify the arguments for evolution. I will give examples of the arguments for evolution. I will give examples of the arguments for evolution. I will counter arguments against evolution using scientific evidence. I will counter arguments against evolution using scientific evidence.

What is an argument?

Argument vs. Couterargument An argument isn’t just something that happens when two people disagree. An argument isn’t just something that happens when two people disagree. In science, an argument is also the evidence for a theory or a scientific law. In science, an argument is also the evidence for a theory or a scientific law. A counter-argument is evidence against an assertion, or statement. A counter-argument is evidence against an assertion, or statement.

Some of the Arguments for Evolution The Fossil Record The Fossil Record Natural Selection and Adaptation Natural Selection and Adaptation Co-evolution/Symbiosis Co-evolution/Symbiosis Homologous Structures Homologous Structures Intermediate Species Intermediate Species

The Fossil Record Supports Evolution Older fossils are found in older, deeper layers of Earth. Older fossils are found in older, deeper layers of Earth. The fossils show changes in organisms over time. These changes happened because of climate and other environmental changes on Earth. The fossils show changes in organisms over time. These changes happened because of climate and other environmental changes on Earth.

Stages of Fossilization: Deposition

As people have dug into the Earth, they first find mammals (like humans, monkeys, and cats,) then lizards (like dinosaurs,) then fish, and then invertebrates (like worms)

Homologous Structures

Studying Homologous Structures hp hp Easy species-sorting game

Why homologous structures support evolution Organisms have similar structures because they have a common ancestor. Organisms have similar structures because they have a common ancestor. The changes in structures, like hands, happen as organisms adapt to their environment. The changes in structures, like hands, happen as organisms adapt to their environment.

Co-evolution Many organisms have coevolved adaptations that are mutually symbiotic. For example, this hummingbird’s beak is specially shaped to feed on this flower. The flowers pollen is only spread by hummingbirds.

Short Video Showing Pollination Ted Talks: Pollination Video Ted Talks: Pollination Video n_beauty_of_pollination.html n_beauty_of_pollination.html n_beauty_of_pollination.html n_beauty_of_pollination.html

Intermediate Species

Some of this archaeopteryx’s traits have more in common with reptiles and some have more in common with modern birds. We call this animal an intermediate species or an evolutionary link.

Evolution of the Dolphin Fossils found in the Sahara Desert were first thought to belong to different animals. Later, scientists found middle evolutionary stages that appear to link land mammals to the equatic mammals that evolved into dolphins.

This Animation Shows the Way that Mammals Evolved to Live in the Ocean =related =related =related =related

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