Unit 4 Science Review

Which description correctly identifies a mammal?

• has scales, lays eggs produces toxins

• has hair, gives live birth, produce milk in milk ducts

• has dry skin, lays eggs, has no backbone

• has scales, gives live birth, produces toxins

Which group of vertebrates possesses gills, two sets of paired fins, and is generally adapted to living in water?

• fish

• reptiles

• mammals

• amphibians

A snake has an internal skeleton, cannot breathe under water, and relies on outside sources of heat to keep its body temperature constant. A snake is which type of animal?

• fish

• bird

• reptile

• amphibian

A salamander has moist skin and lays eggs. It breathes through lungs or gills, depending on the species. A salamander is which type of animal?

• fish

• amphibian

• mammal

• reptile

Sometimes animals may look very different but still possess a body structure that would enable scientists to group them together. What do fish, amphibians, reptiles, birds, and mammals have in common?

• lungs

• legs for locomotion

• backbones

• external skeletons

How are mammals different from other vertebrates?

• They use lungs to breathe

• They have cartilage instead of bones

• They produce milk to feed young.

• They do not hibernate.

Which of the following sentences is true of reptiles and amphibians?

• Amphibians have live young and reptiles hatch from eggs.

• Amphibians live only on land and reptiles live only in water.

• Amphibians have moist skin and reptiles have dry scales.

• Amphibians do not have backbones and reptiles do.

Which term describes an animal without a backbone?

• A. chordate

• B. invertebrate

• C. protozoan

• D. vertebrate

What type of vertebrate has smooth, moist skin, several glands, four limbs, and lays jellylike eggs in water?

• reptile

• bird

• mammal

• amphibian

Which of the following types of wildlife are NOT vertebrates?

• birds

• reptiles

• mammals

• crustaceans