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What is a characteristic feature of vertebrate animals?

• They have a soft body.

• They have an articulated internal skeleton.

• They have a hard external shell.

• They do not have any skeletal structure.

Which of the following is NOT a group of vertebrates?

• Mammals

• Birds

• Fish

• Mollusks

What defines invertebrate animals?

• They have an internal skeleton.

• They have a backbone.

• They do not have an internal skeleton.

• They are always soft-bodied.

What is the purpose of the hard external structure that some invertebrates possess?

• To help them fly.

• To provide protection for the body.

• To help them digest food.

• To attract mates.

Which of these is a group of invertebrates?

• Reptiles

• Amphibians

• Arthropods

• Birds