Directions:Complete the following sentences using the terms listed below.

1. The body temperature of a(n) ____________________ changes with its surroundings.

2. A(n) ____________________ is a structure that later develops a brain at one end.

3. Muscles attach to the ____________________, which protects internal organs.

4. The ____________________, a structure along a chordates body, becomes the backbone.

5. A (n) ____________________ has a body temperature that stays the same in all climates.

6. ____________________ are found between the mouth and digestive tube in all chordates.

7. A period of inactivity in the winter is known as _________________________________________________________________.

8. Fanlike structures used by fish for steering and balancing are called __________________________________________________________________-.

9. ____________________ are overlapping, thin, hard plates that cover a fishs body.

10. A(n)____________________ is a muscular structure at the end of the developing chordate.

11. ____________________ is a period of inactivity during hot summer months.

12. Your ears and the tip of your nose are made of ________________________________________________________________.

13. ____________________ and cartilage make up the backbone that surrounds and protects the

14. ____________________ have a notochord, a nerve chord, and gill slits at some time during

15. The fluid-filled sac enclosed by a leathery shell that houses developing reptilian embryos is

1. List four characteristics common to all chordates.

VOCAB FOR TEST

a. amniotic egg   

b. biological indicator

c. cartilage

d. chordate

e. nerve cord

f. ectotherm

g. endotherm

h. estivation

i. fin

j. gill slits

k. hibernation

l. notochord

m. scales