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When changes occur in the environment that make it hard for an organism to survive one of two things will happen
- an organism evolves new
adaptations
- an organism becomes
extinct

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How Evolution through Natural Selection works.

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How Evolution through Natural Selection works.

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4  Why did the brown bear evolve into the polar bear

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Just So Darwin Why did the brown bear evolve into the polar bear? Animation describing how brown bears adapted to life in the Arctic. Sam, a young tortoise, is hungry. Grandad Charlie tells him a story about how brown bears had to travel a long distance to find food.

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What evidence is there that Evolution has occurred?

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What evidence is there that Evolution has occurred?

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Fossils which provide evidence of how organisms have changed over time

DNA which allow us to compare the genetic code of organisms and draw conclusions about how they are related to each other

Similar structures such as similar bones point to organisms coming from a common ancestor

Embryology: the study of embryos hints that all animals with backbones evolved from a common ancestor that was like a fish

Evolution is happening right now: We see that bacteria have evolved to be resistant to antibiotics because of natural selection

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The Principals of Evolution by Natural Selection

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The Principals of Evolution by Natural Selection

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Charles Darwin said that evolution happened through natural selection. He theorized that organisms change over time because specific traits allow an organism to survive and reproduce better. In other words, nature picked winning and losing traits. The winning traits became the dominant trait over time. Below are the 4 things that had to happen for natural selection to occur.

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It is the process by which a population of organisms change over time

What is a Population? A population is a group of the same organisms living in the same place at the same time.