What is the primary distinction between vertebrates and invertebrates?

• Vertebrates have a backbone, while invertebrates do not.

• Vertebrates are warm-blooded, while invertebrates are cold-blooded.

• Vertebrates lay eggs, while invertebrates give live birth.

• Vertebrates have feathers, while invertebrates have scales.

Which of the following is NOT a characteristic of mammals?

• They are warm-blooded.

• They lay eggs with hard shells.

• They have hair or fur.

• They feed their young with milk.

What group do insects, arachnids, and crustaceans belong to?

• Arthropods

• Mollusks

• Echinoderms

• Cnidarians

Which of the following traits is unique to echinoderms?

• Radial symmetry

• Segmented bodies

• Stinging cells

• Exoskeleton

What is a common characteristic of amphibians?

• They have smooth skin and can breathe through their skin.

• They have scales and lay eggs with leathery shells.

• They have feathers and hollow bones.

• They have segmented bodies and jointed limbs.