Animals - 6th grade

Which group of invertebrates have a hard outer covering called an exoskeleton?

• reptiles

• mollusks

• arthropods

• echinoderms

Which animal takes in dissolved oxygen through their skin?

• earthworm

• sea star

• slug

• octopus

Which group of vertebrates go through a metamorphosis?

• mammals

• reptiles

• fish

• amphibians

Which of these behaviors represents an example of hibernation?

• A skunk sprays a foul-smelling oil when a predator comes too close to it.

• A male bird sings a specific song to attract female birds of the same species.

• Caribou travel hundreds of kilometers before winter starts, and then return in the spring.

• A beaver slows down its activities and remains in its home throughout the winter.

What is a disadvantage for endothermic animals?

• Some species will hibernate or migrate because of weather conditions.

• Some species will hibernate or migrate because of weather conditions.

• They can live in almost any environment.

• They need to be able to consume a large amount of food.

Oysters and slugs are both mollusks. What structure do they both have in common?

• spiny skin

• thick muscular foot

• jointed legs

• pores

Which statement explains why a frog is a vertebrate and not an invertebrate?

• Frogs are ectothermic.

• Frogs lay eggs in water.

• Frogs have a circulatory system.

• Frogs have a backbone.

A fiddler crab will wave its claw to attract a female. This is behavior that helps the crab

• defend itself.

• move from place to place.

• find a mate.

• obtain food.

Sea stars, squids, sea urchins, and leeches are all

• echinoderms.

• mollusks.

• invertebrates.

• arthropods.

Most birds probably migrate because

• they store digested food in a crop

• they cannot regulate their body temperatures

• they are probably descended from reptiles

• food sources change with seasons