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Excretion

(page 861)

gills

20. In nonvertebrate chordates and fishes,

play an important role in

kidneys

excretion. However, most vertebrates rely on

21. Circle the letter of each chordate that eliminates nitrogenous wastes as urea.

a. tunicates

c. birds

b. reptiles

d. mammals

The kidneys regulate the

22. How do vertebrate kidneys help maintain homeostasis?

amounts of water, salt, and other substances dissolved in body fluids.

Response

(page 862)

23. Is the following sentence true or false? Nonvertebrate chordates have a complex brain

false

with distinct regions.

24. Circle the letter of the part of the brain that controls the function of many internal

organs.

a. medulla oblongata

c. olfactory bulbs

b. optic lobes

d. cerebrum

25. Is the following sentence true or false? The cerebrum and cerebellum are most developed

true

in birds and mammals.

Movement

(page 863)

muscles

26. Although nonvertebrate chordates lack bones, they do have

Along with

27. What structures make it possible for vertebrates to control movement?

muscles, the backbone and ligaments support the body, making it possible to control movement.

Reproduction

(page 864)

28. Is the following sentence true or false? Vertebrate evolution shows a general trend from

false

internal to external fertilization.

29. Circle the letter of development in which the eggs develop internally and the embryos

receive nutrients from the yolk surrounding them.

a. oviparous

c. viviparous

b. ovoviviparous

d. asexual

504

Guided Reading and Study Workbook/Chapter 33

Form And Function In Chordates Worksheet Page 3

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