AnswersCO-Biology B-CRUnit Test

Overview of Animals Answers

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1
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Clams and oysters are examples of invertebrates.

A
shell
B
backbone
C
gills
D
muscles
2
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A scientist discovers a new organism and is trying to classify it. Which observations would most likely indicate that the organism is an animal?

A
It is multicellular and can move itself from place to place.
B
It is heterotrophic and unicellular.
C
It makes food from sunlight and is eukaryotic.
D
It is prokaryotic and can move itself from place to place.
3

Which function allows animals to find mates?

A
movement
B
homeostasis
C
reproduction
D
feeding
4

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A
homeostasis
B
heterotrophs
C
adaptation
D
eukaryotic
5

Which statement describes a difference between a jellyfish and a frog?

A
A jellyfish lacks vertebrae, whereas a frog has a spinal cord.
B
A jellyfish cannot reproduce sexually, but a frog can.
C
A jellyfish makes its own food, whereas a frog is a heterotroph.
D
A jellyfish is a prokaryote, whereas a frog is a eukaryote.
6

Which two characteristics do all animals have?

A
They are symmetrical and heterotrophic.
B
They are heterotrophs and have a backbone.
C
Their cells have a nucleus and membrane-bound organelles.
D
They have a backbone, and their cells have membrane-bound organelles.
7

Brendan made a chart to categorize the characteristics of animals.

Question illustration
A
Are multicellular
B
Have membrane-bound organelles
C
Produce their own food
D
Display an asymmetrical body plan
8

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A
multicellular
B
heterotrophs
C
eukaryotes
D
vertebrates
9

What is a function of the backbone in animals?

A
It protects against predators.
B
It regulates blood glucose.
C
It surrounds the spinal cord.
D
It limits movement.
10

Which statement best explains why invertebrates often have outer skeletons but vertebrates do not?

A
The outer skeleton provides protection, since invertebrates do not have backbones.
B
The outer skeleton surrounds the spinal cord, since invertebrates do not have backbones.
C
The outer skeleton helps invertebrates maintain homeostasis, since they lack spinal cords.
D
The outer skeleton helps invertebrates maintain homeostasis, since they lack membrane-bound organelles.

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