McGraw-Hill Online Learning Center Test<BLURT>

McGraw-Hill Online Learning Center Test

1. Review the animation and answer the following questions.

The earliest fossil vertebrates found were

A. jawed fish.
B. examples of filter-feeding fish.
C. about 400 million years old.
D. able to take in large amounts of food.

2. Research suggests that fish jaws developed from A. modified snouts.
B. modified mouths.
C. gill arches.
D. changes in the skull region necessary to reach into small places for food.

3. The evolution of jaws is believed to be a major step in the further evolution of animals because jaws allowed A. the gills to be used only for obtaining oxygen.
B. the owners to better defend themselves and their young.
C. communication between members of the same species.
D. animals to take in larger amounts of nutrients.

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