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High School Biology: Introduction to Animals (Fill in the blank)
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High School Biology: Introduction to Animals (Fill in the blank)
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10 Questions

1. Roundworms have a partial, fluid-filled body cavity called a(n) __________.

2. The first type of symmetry to evolve was __________ symmetry.

3. All animals with a backbone are classified as __________.

4. The __________ is a non-bony skeleton on the outside of the body of some animals.

5. The animal phylum that includes human beings is the __________.

6. An immature stage of an animal that differs from the adult form is called a(n) __________.

7. The division of an animal body into multiple segments is called __________.

8. The outer embryonic cell layer of animals is the __________.

9. Scientists think that the earliest animals evolved from organisms in the __________ kingdom.

10. The __________ is a rigid rod that runs the length of the body in chordates.

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