EXTERNAL and INTERNAL STRUCTURES IN ANIMALS

A body part on the outside of an animal that helps it survive is called a(n) _____

• internal structure

• external structure

• organism

• brain

Claws are external structure. It can be used to help some animals ______.

• swim

• climb trees

• sleep

• breathe

The outer covering of birds is made of ______. It is an external structure.

• fur

• scales

• feathers

• metal

Which of these is an external structure of a crab?

• hard shell

• scales

• feathers

• soft skin

Check the structures that help with movement. Choose three answers.

• A seagull's wings

• A ant's mouthparts

• A frog's tongue

• A tiger's padded feet

• An ostrich's long legs

Check the structures that help with feeding. Choose three answers.

• A seagull's wings

• A ant's mouthparts

• A frog's tongue

• A tiger's padded feet

• A snake's fangs

Does the structure pictured help the animal function in movement, eating or covering for protection?

Image: Ant's Legs

• movement

• covering

• eating

The main function of the ______________ is to combine oxygen with the blood and eliminate carbon dioxide.

• Brain

• Heart

• Lungs

• Liver

Which of the following is true about your heart?

• Your heart may stop beating from time to time.

• You have to think in order to keep your heart beating.

• Your heart pushes blood through your body.

• All of the above

The _____________ controls our body systems and allows us to think and feel emotions.

• liver

• lungs

• heart

• brain