Evolution and Classification

How does embryology support the Theory of Evolution?

• It shows that they have a common ancestor because of their similarities.
•          I'm not sure.
• Animals change over time. 

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A change in the inherited characteristics of an organism over time is ________

• evolution.
• development.
• growth.
• ancestry.

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The most recent ancestral form or species from which two different species evolved is known as ________________________.

• a common ancestor.
• an embryonic stage.
• development.
• evolution.

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Common ancestry relates to evolution because

• evolution only happens when there are common ancestors.
• Common ancestors make evolution happen more quickly.
• evolution can never take place with common ancestors.
• the more two organisms have in common, the more recent is their common ancestor during their evolution.

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In stage one (top row) of these embryos, most of the embryos________

• look very similar.
• have very different features.
• show different stages of development.
• have only a tail if they are non-human.

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In the the third embryonic stage (bottom row), mammal embryos _____

• have more characteristics in common with each other than with reptiles or birds.
• are still hard to tell from reptiles and birds.
• have the same features as fish, reptiles, and birds.
• do not have tails.

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In stage 2 (middle row) fish embryos _________

• are very different bird and mammal embryos.
• are still very similar to bird and mammal embryos.
• show arm and leg buds.
• are the only embryos with tails.

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What type of evidence is represented in the picture above:

• Fossils

• Vestigial Structures

• DNA

• Homologous Structures

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What type of evidence is shown in the image above?

• Fossils

• Vestigial structures

• Homologous Structures

• DNA

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What type of evidence are shown in the picture above?

• Fossils

• Embryology

• Homologous Structures

• Vestigial Structures

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NGSS.MS-LS4-3