Chapter 32

Question 1

animals

Answer 1

heterotrophs

Question 2

cells lack cell walls

Answer 2

animals

Question 3

conduct nerve impulses

Answer 3

nervous tissue

Question 4

allow body movement

Answer 4

muscle tissue

Question 5

bodies are held together by

Answer 5

structural proteins eg. collagen

Question 6

most animals reproduce sexually/___ stage dominates life cycle

Answer 6

diploid

Question 7

In most animals, a small sperm fertilizes a large egg to form a

Answer 7

zygote

Question 8

cells arrange themselves in a hollow ball called a

Answer 8

blastula

Question 9

during this phase, the cells become organized into layers of embryonic tissues from which the adult body parts are produced

Answer 9

gastrulation (gastrula)

Question 10

Most animal life cycles include an immature form called a

Answer 10

larva

Question 11

this undergoes metamorphosis to give the adult form

Answer 11

larva eg. a tadpole and the adult frog

Question 12

___ ___ of a common ancestor of living animals lived in the ___ of the Earth about ___ ___ years ago.

Answer 12

Fossil evidence; waters; 700 million

Question 13

Animals started to move to land ___ ___ years ago.

Answer 13

460 million

Question 14

Fossil evidence that vertebrates made transition to land from water around ___ ___ years ago.

Answer 14

360 million

Question 15

Animals classified according to ___ of their bodies, or lack of it

Answer 15

symmetry

Question 16

Least evolved animals= ?

Answer 16

no symmetry eg. sponge

Question 17

top side and bottom side but no front and back ends, no left and right sides

Answer 17

radial symmetry eg. sea anemone

Question 18

2 sided symmetry

Answer 18

bilateral symmetry

Question 19

top side

Answer 19

dorsal

Question 20

bottom side

Answer 20

ventral

Question 21

head end

Answer 21

anterior

Question 22

tail end

Answer 22

posterior

Question 23

development of a head

Answer 23

cephalization