Science Practice 4th Grade

Is a rigid support system that includes bones that connect to the soft structures of the body.

• Skeleton

• Skull

• Shell

Animals with internal skeleton are called:

• frogs

• vertebrates

• backbone

Is the internal organ that pumps blood.

• Lungs

• Gills

• Heart

Which part of the skeleton protects the heart?

• skull

• ribs

• backbone

Heart of vertebrates that live in water pumps the blood:

• In one circular motion.

• In two different circles

• doesn't pump blood.

Heart of vertebrates that live on land pumps blood:

• In one circular motion

• In two different circles

• Doesn't pump blood

The picture shows:

• 1: backbone , 2: skull

• 1: ribs , 2: backbone

• 1: backbone , 2: ribs

The picture shows:

• 1: legs , 2: skull

• 1: skull , 2: legs

• 1: backbone , 2: legs

Takes in oxygen from the air and provides it to the blood.

• Gills

• Lungs

• Heart

Take in oxygen from the water.

• Gills

• Lungs

• Heart