___ is the structure of a living thing.

___ structures are found on the inside of living things.

___ structures are found on the outside of living things.

___ are behaviors or physical characteristics that help an organism to survive and reproduce in its environment.

A ___ is a community of plants and animals that have common characteristics for the environment in which they exist.

Leaves, bark, and flowers are ___ structures of plants.

The heart, brain, and stomach are ___ structures of animals.

Legs, claws, and wings are ___ structures of animals.

Heart, lungs, and brain are ___ structures of animals.

In the aquatic biome, fish have ___ for taking in oxygen and fins for movement.

Lily pads have wide ___ in order to take in sunlight.

Whales and sea lions have a layer of ___, or fat, under their skin to keep them warm.

Polar bears and arctic foxes have thick ___ to keep them warm.

Many desert animals are ___, meaning they sleep during the day and are active at night.

Giraffes have long ___ so they can reach a lot of food sources that other animals can't reach.

Some birds have long ___ to help them eat nectar from flowers.

Blending in with the environment is called ___.

Desert plants may have ___ to protect them from thirsty animals.

Some animals may ___, or move from one place to another, when their environment gets too cold or when food is hard to find.