Lucia took a quiz about science safety. One of the questions asked what to do if a glass ____ in the classroom. Lucia knows she should report it to the teacher instead of cleaning up the pieces by herself.

Crabs are interesting-looking creatures that live mostly in saltwater. Crabs are crustaceans. Crustaceans do not have a backbone. Instead, they have a hard outer shell called an exoskeleton. This hard shell helps protect the crab's body from predators looking for a meal. Crustaceans also have two pairs of antennae used to touch and feel what is in their path. Crabs have 10 legs. The front two legs are claws with powerful pinchers. These claws have two functions. They fight off predators and gather food. Once crabs find food, they use their claws to pick the food up and bring it to their mouth.

What does the crab's exoskeleton do?

People often use the words "turtle" and "tortoise" when they talk about a "four-legged" animal with a shell. But there are important differences between these two animals that some people are not aware of.

Turtles live mainly near water. They use water to get food such as fish and worms, and they often go into the water to escape from predators on land. A turtle shell is usually much smoother than a tortoise shell. This helps the turtle swim through the water more easily. A turtle has webbed feet to help it paddle in the water.

Tortoises live on land almost all the time. They don't swim very well. Tortoise shells are bumpier, and their feet don't have webs between the toes. Tortoises normally go into small puddles of water only to cool off and soak themselves. A tortoise eats many different foods, including mushrooms, wild berries, worms, and insects.

What is one way turtles and tortoises are similar?

At the end of the test, the teacher told the students to put ____ their pencils.