Fill in the blank.

The brain receives the stimulus, interprets it, and tells the body how to _______.

Match the function below with the correct organ.

This organ pumps blood around the body.

Match the function below with the correct organ.

This organ gives shape and helps in movement.

Match the function below with the correct organ.

This organ receives and interprets messages.

Match the function below with the correct organ.

This organ breathes in oxygen and exhales carbon dioxide.

Which organ is responsible for the way an animal responds to things it smells, hears, and touches?

The function of this structure is to _____________________.

Look at the chart comparing structures in humans to structures in fish. Which structure correctly completes the chart?

What is one way thorns help a plant?

Animals that live on land typically have hearts that pump blood in __________.

Animals that live in the water typically have hearts that pump blood in __________.

Which three organisms have a rigid support system that includes bones?

Click on all organisms that have bones.

Look at the picture to complete the sentence below.

The ___________ is a hard external covering that is waterproof.

Look at the picture to complete the sentence below.

The exoskeleton helps the animal in the picture survive its watery environment by __________ its internal structures.

Which sentence describes a behavior that helps an animal survive?

Look at the chart. Which function best completes the chart?

Complete the sentence to correctly compare external structures in plants and animals.

Plant leaves have a _______ to keep unwanted water from entering a plant.

Complete the sentence to correctly compare external structures in plants and animals.

Some animals rely on waterproof ____________ to keep unwanted water away.

Which picture best shows what happens when a species of animals goes extinct?