Which of these is NOT a stage in complete metamorphosis?

Molting occurs during the gradual metamorphosis of an insect whenever

Which arthropods have no antennae?

Where do most crustaceans live?

Which of these is NOT an arthropod?

Which of these is NOT an insect?

An organism that eats wastes and dead organisms is a

At some point in their lives, all chordates have a flexible supporting rod in their backs called a

The latest group of vertebrates to evolve was probably the

If an animal is an ectotherm, it has

Most fishes reproduce by means of

Which of the following fishes has a skeleton made of hard bone?

Most adult amphibians can obtain oxygen through

Fossils are most often found in

An animal whose body temperature does not change much, even when the temperature of the environment changes, is called

Which characteristic is NOT common to all mammals?

Which of these consumers is a herbivore?

What characteristic is used to classify a mammal as a monotreme, marsupial, or placental mammal?

Fur is an adaptation that allows mammals to

Which of the following is a biotic factor in the prairie ecosystem?

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