Ch. 5 part 3

Question 1

Jesse found a sea star at the beach. He knew it was ____ because it had radial symmetry and tube feet.

a. a mollusk
b. an echinoderm
c. a sponge
d. a flatworm

Answer 1

B. an echinoderm

Question 2

Even though they look different, both an octopus and an oyster are _____ because they have a soft body and a mantle.

a. mollusks
b. echinoderm
c. roundworms
d. arthropods

Answer 2

a. mollusks

Question 3

A(n) ____ gets its food from water that flows through its body.

a. jellyfish
b. ostrich
c. sponge
d. crab

Answer 3

c. sponge

Question 4

Animals such as earthworms are classified as _____ because they have segments and move by using setae.

a. annelids
b,. roundworms
c. arthropods
d. mollusks

Answer 4

a. annelids

Question 5

Shrimp and spiders are both considered to be ____ because they have jointed legs, a segmented body, and an exoskeleton.

a. annelids
b. mammals
c. echinoderms
d. arthropods

Answer 5

d. arthropods

Question 6

What characteristics do most of the animals phyla have in common?

Answer 6

They do not have a backbone. they are invertebrates.

Question 7

why is a spider classified as an arachnid and not as an insect?

Answer 7

a spider has two segments and eight legs which makes it an arachnid.
insects have three body parts and six legs.

Question 8

why can some ticks cause serious human health problems

Answer 8

tick bites can spread diseases.

Question 9

why would cold-blooded animals have difficulty surviving polar regions?

Answer 9

cold-blooded animals get their body heat from their environment. They would die in cold regions.