What evidence supports evolution? Chapter 4.3 What evidence supports evolution?

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The ____________shows that there were many changes throughout Earth’s history. Climate (weather) changed many times. Dinosaurs are the best evidence that there were many animals that lived millions years ago. Dinosaurs are now extinct animals.

SIMILAR BODY STRUCTURES: Similar body structures are body parts that have the same basic structure. _____________________ in different organisms are clues that these organisms may have evolved from the same ancestor. Bird’s wing, dolphin’s flipper, and dog’s foreleg have similar structures.

Bird’s wing, dolphin’s flipper, and dog’s foreleg have similar structures. Embryos of closely related animal are similar.

SIMILAR BODY STRUCTURES: ___________________: are body parts that seem to have no function. Your appendix is an example of a vestigial structure. There is no function for our appendix. Some scientists believe that a long time ago in ancestors, these vestigial structures had a function.

Vestigial structures: Tailbone in humans has no function. Appendix in different animals have no function.

DNA EVIDENCE- DNA evidence: scientists study DNA to study and learn more about evolution. For example, scientists found that dogs and bears have very similar DNA. This means that dogs and bears have evolved from a ___________________.

The changing horse Evolution in horse: -became taller, bigger -became heavier -from three to one toe -the number of leg bones has changed

Checking concepts: What does the fossil record show?

Why is the horse used to support the theory of evolution?

How can living things provide clues to support the theory of evolution?

Fill in blanks: _______________ are structures that have no function. _______________ shows comparison of DNA in different animals. _____________ is a record that shows skeletal remains of extinct animals. Body parts that have the same basic function are called __________________.