Evidence of Common Ancestry Review

Finding fossils of coral along a highway is evidence that

• the road was once underwater

• coral used to live on land

• in the past, the area was underwater

• coral was used to build the road

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Index fossil are used to

• mark a place in the rock layers

• find out how an animal once lived

• identify rocks of the same age

• determine present environments

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Fossils can be used to

• identify past environments

• identify past geologic events

• identify past climates

• all of the above

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In order to protect themselves from predators, trilobites may have

• used poison

• swam very fast

• hid in the sand

• curled up

When geologists find fossil shells in rock layers in the mountains, they can tell that

• the area was once sediments on the seafloor and then uplifted

• sea level must have been much higher

• the shelled animal could move on land

• large waves must have moved the shells up the mountain

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Animals with hard parts are more likely to form fossils than soft bodied animals because

• the bones can get carried away by scavengers

• bones are big enough to be seen

• hard parts are more likely to be preserved rather than decay

• no one can eat the bones

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If you find fossil pollen, this may help you determine

• when the area was underwater

• the behavior of animals that were present

• when mountain building occurred

• the past ecosystem

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The fossil record includes

• only fossils that have ever been found

• all fossils that exist, even if still buried

• all life that ever existed, even if it never formed a fossil

• only fossils we can identify what the organism was

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Paleontologists estimate that less than __________ of life existing today will eventually form fossils.

• more than 50%

• 25% to 45%

• 15% to 20%

• less than 10%

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Which environment is best for possible fossil formation when an organism dies?

• rocky coastal area

• rain forest

• area near volcanic activity

• quiet lake environment

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