The Fossil Record

_________________ show clear changes in an organism over time, the environment organisms lived in, the time period the organism lived in, and where the organism lived.

• DNA

• Vestigial structures

• Fossils

• Homologous structures

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Which IS NOT used as evidence for evolution?

• Fossils

• Natural Selection

• Early Development/Embryos

• Body Structure/Anatomy

• DNA/Proteins

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The diagram shows fossils in different rock layers. Which of these statements about the age of these fossils is most likely correct?

• Fossil A and C are the same age
  
• Fossil B is older than fossil C
• Fossils A is older than fossil B
• Fossil D is older than fossil C

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The fossil record help scientists

• better understand the kinds of organisms that lived in the past

• better understand how the environment has changed over time

• better understand how organisms have evolved over time

• all of the above

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The earliest organisms were ___________; the more recent organisms are ____________.

• simple; more complex

• complex; more simple

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What is the value of a transitional fossil?

• Transitional forms show the evolutionary steps between species.

• Transitional forms show major extinction events

• Transitional forms show how analogous traits form

50 million years ago, the Pakicetus had nostrils toward the front of it's skull Gray whales, modern-day descendants of the Pakicetus have nostrils toward the back of the skull. The Aetiocetus lived 25 million years ago, and it's nostril was in the middle of the skull. In this case, the Aetiocetus serves as a ______________.

• index fossil

• transitional fossil

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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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The fossil record shows that:

• Most species have not evolved.
• Some species are evolutionary transitions between major groups of organisms.
• All species are today just as they were when they were created.
• All of the above.

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