Overview of Animals Answers

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1
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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.
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

multicellularheterotrophseukaryotesvertebrates

A
multicellular
B
heterotrophs
C
eukaryotes
D
vertebrates
4

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
5

Which three steps describe how an animal obtains and uses energy for growth?

A
First, an animal eats another organism. Then, food is built into larger molecules. Next, the animal’s cells use molecules to make new cells.
B
First, food is built into larger molecules. Then, the animal eats another organism. Next, the animal’s cells use molecules to make new cells.
C
First, an animal eats another organism. Then, food is broken down into smaller molecules. Next, the animal’s cells use molecules to make new cells.
D
First, food is broken down into smaller molecules. Then, the animal eats another organism. Next, the animal’s cells use molecules to make new cells.
6

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.
7

homeostasisheterotrophsadaptationeukaryotic

A
homeostasis
B
heterotrophs
C
adaptation
D
eukaryotic
8

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 term represents animals with backbones?

A
invertebrates
B
heterotrophs
C
autotrophs
D
vertebrates

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