Select the one animal that has all of the amphibian traits listed above.
Red-eye tree frogs lay eggs with no shells. When tadpoles first hatch from the eggs, they live in water. When the tadpoles grow into adults, they live in trees. Adult tree frogs have moist, smooth skin and sticky pads on their toes. The sticky pads help the frogs hold on to leaves. Cardinalfish have scaly skin and live near coral reefs. Cardinalfish lay eggs with no shells and have fins that help them swim underwater.
Amphibians are a group of animals with similar traits. The following traits can be used to identify amphibians:
They spend part of their lives in water and part on land.
They have moist skin.
They make eggs with no shells. Observe the animals and read the descriptions.
Scientists sort animals with similar traits into groups. This is called classification. Classification helps scientists learn about how animals live.
How do scientists classify animals? First, they make observations about an animal. Scientists observe the animal's traits, including its body parts and behavior. Then, scientists compare the animal's traits to other animals' traits. Scientists classify animals with similar traits into a group.
To decide if an animal is part of a group, look at the traits of the group.
Amphibians have the following traits:
They spend part of their lives in water and part on land.
They have moist skin.
They make eggs with no shells.
Compare each animal's traits to the group's traits. Select the animal with traits similar to the group's traits.
A red-eyed tree frog has the following traits:
It spends part of its life in water and part on land.
It has moist skin.
It makes eggs with no shells.
A red-eyed tree frog has the traits of an amphibian. A red-eyed tree frog is an amphibian.
A cardinalfish has the following traits:
It has fins, not limbs.
It makes eggs with no shells.
A cardinalfish does not have all of the traits of an amphibian. A cardinalfish is a fish.