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High School Biology: From Fish to Birds - Overview of Vertebrates (Fill in the blank)
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High School Biology: From Fish to Birds - Overview of Vertebrates (Fill in the blank)
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8 Questions

1. ____________ were the first class of vertebrates to evolve.

2. There are about 50,000 vertebrate species, and they are placed in ____________ different classes.

3. ____________ of the classes of vertebrates are fish classes.

4. ____________ refers to the development and nourishment of an embryo within the mother’s body.

5. The ____________ houses and protects the spinal cord.

6. ____________ is less flexible than cartilage but stronger.

7. ____________ is regulating body temperature from the inside through metabolic or other physical changes.

8. Most vertebrates have ____________ covered with scales, feathers, fur, or hair.

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