Select the one animal that has all of the mollusk traits listed above.
White-spotted octopuses have tentacles, which are also called arms. White-spotted octopuses can use their tentacles to reach between corals and grab fish. These octopuses have a soft red body with white spots. Blue crabs are omnivores. Omnivores are animals that are adapted to eat both plants and animals. Blue crabs have an exoskeleton and two pairs of antennae.
Mollusks are a group of animals with similar traits. The following traits can be used to identify mollusks:
They have a soft body.
They have a muscular foot or tentacles. 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.
Mollusks have the following traits:
They have a soft body.
They have a muscular foot or tentacles.
Compare each animal's traits to the group's traits. Select the animal with traits similar to the group's traits.
A white-spotted octopus has the following traits:
It has a soft body.
It has tentacles.
A white-spotted octopus has the traits of a mollusk. A white-spotted octopus is a mollusk.
A blue crab has the following traits:
It has two pairs of antennae.
It has an exoskeleton.
A blue crab does not have all of the traits of a mollusk. A blue crab is a crustacean.