Have backbones. Are cold-blooded (ectothermic). Can breathe in water with gills in early stages – breathe on land with lungs as an adult. Go through metamorphosis. Lay jelly-like eggs.

Have backbones. Are cold-blooded (ectothermic). Breathe with lungs. Most lay eggs although in some _______ the eggs hatch inside the females. Have plates or scales.

Have backbones. Are warm-blooded (endothermic). Breathe with lungs. Have babies that are born live, have fur or hair, and produce milk to feed their young.

Have backbones. Are warm-blooded (endothermic). Breathe with lungs. Lay eggs, have feathers, a beak, two wings, and two feet.

They are very simple animals that have many pores (holes) through which water flows. Water moves into a central cavity and out through a hole in the top.

They have long, tube like bodies that are divided into segments. They are the simplest organism with a true nervous system and blood contained in blood vessels. Examples are earthworms and leeches.

They have soft bodies and most have thick muscular foot for movement or to open and close their shells. They have more developed body systems than sponges or worms. They take in oxygen through their gills or lungs. Some have shells. Examples are slugs, snails, clams, and octopuses.

They have arms that extend from the middle of the body. They have tube feet that take in oxygen from the water. They have spines. Examples are sea stars, brittle stars, sea cucumbers, and sea urchins.

They have jointed legs, have a hard outer covering called an exoskeleton, and have segmented bodies. Some have wings. They obtain oxygen from the air through gills or air tubes. Examples are insects, arachnids, and crustaceans.

These animals do NOT maintain a constant body temperature. They are called cold-blooded because their body temperature is close to the temperature of their surroundings

Endothermic These animals maintain a nearly constant internal body temperature regardless of the temperature of their environment. They are called warm-blooded.

Fish, Amphibians Reptiles

Mammals Birds

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