Quiz. Introduction to the Animal Kingdom

Vocabulary Review. What terms are missed:

1. An animal without a backbone is called a (an) _______.

2. In sexual reproduction, the zygote undergoes a series of divisions to form a (an) ________, a hollow ball of cells.

3. A (An) _____ is an animal whose mouth is formed from the blastopore.

4. In _______ symmetry, only a single imaginary plane can divide the body into two equal halves.

5. The concentration of sense organs and nerve cells at the front end of the body is called ______ .

6. A (An) _______ is an immature stage of an organism that looks different from the adult form.

Answer the questions:

7. What are the names of an animal’s three germ layers?

8. What is a body cavity?