chapter 1

Question 1

Which is not a domain of life?

Answer 1

metazoa

Question 2

Which is a unique characteristic of animals?

Answer 2

Blastula and gastrula stages

Question 3

The hypothesized common ancestor of all animals is thought to be similar to:

Answer 3

A sponge-like protist called a choanoflagellate

Question 4

Which criteria is not used in the classification of animals?

Answer 4

number of legs

Question 5

What term is used to describe animals with no body cavity?

Answer 5

acoelomate

Question 6

Diploblastic animals possess what?

Answer 6

two major tissue layers : ectoderm and endoderm

Question 7

What is the main characteristic that distinguishes vertebrates from invertebrates?

Answer 7

presence of a vertebral column

Question 8

Which type of animal would be classified as an arboreal animal?

Answer 8

animals that live primarily on trees

Question 9

Which is not a benefit of invertebrates to humans?

Answer 9

spreading diseases

Question 10

In the early development pattern, what is the term used for the first opening that forms in an embryo?

Answer 10

blastopore

Question 11

which animal are considered Eumetozoa?

Answer 11

animals with organized tissues and organs

Question 12

The body cavity that is completely lined by mesoderm is called:

Answer 12

coelom

Question 13

what type of symmetry do jellyfish possess

Answer 13

radial symmetry

Question 14

The term “protostome” refers to animals in which the:

Answer 14

Blastopore becomes the mouth

Question 15

What is the main distinction between diploblastic and triploblastic animals?

Answer 15

Number of tissue layers

Question 16

Which habitats would an amphibian most likely inhabit?

Answer 16

Both land and water

Question 17

Why is it important to study invertebrates, according to the document?

Answer 17

They play an important role in ecosystems and have intrinsic value

Question 18

Which is a characteristic of protostome development?

Answer 18

The blastopore becomes the mouth

Question 19

The term “triploblastic” refers to animals that have:

Answer 19

Three germ layers

Question 20

Which type of animal is considered a pseudocoelomate?

Answer 20

Roundworms