Most chordates that live on land have:

The evolution of jaws and paired fins was an important development during the rise of:

Which two body plan characteristics are shared by arthropods and vertebrates?

What body plan features did Cambrian animals evolve that made them more likely to become fossils?

Which of these invertebrate animals is in the phylum Porifera?

Which of these animals is in the phylum cnidaria, and have nematocysts that contain poison? Select all that apply.

What type of fish was well on the road to land-dwelling tetrapods?

What type of mammal are we?

Birds and mammals share which of these characteristics?

The shared traits of organisms are the basis for their organization into:

Which of these animals are vertebrates? Select all that apply.

What trait evolved in the common ancestor of all animals?