Animals are autotrophs.

The animal kingdom has three main characteristics.

Eukaryotic cells has a true nucleus.

The animal kingdom contains 35 phyla - one being chordata.

Agnatha means jawless fish.

Osteichthyes means cartilaginous fish.

A kangaroo is a montoreme.

A lamprey is an example of a jawless fish, an agnatha.

A trout is an example of a cartilaginous fish.

A puffin is a mammal.

All kinds of fish have a two chambered heart.

Animals in the classes Amphibia, Reptilia, Aves, and Mammalia all have 3 chambered hearts.

Amphibians breath via lungs, gills, and skin.

Ectoderm is the middle layer.

A characteristic used to classify animals is whether or not they have a backbone.

Sessile means stationary, stays in one spot.

Coelem is a fluid-filled body cavity.

Only muscle tissues are necessary in the evolution of movement.

Humans use external fertilization.

Bony fish have a bone and cartilage endoskeleton.

Guppies, tuna, and salmon are all examples of bony fish.

Levels of organization go: cells -> tissues -> organs -> organ systems.

Most animals have three layers of cells that develop during early stages of embryonic growth.

There are 4 main classes of chordata.

All of these are characteristics used to classify animals:
-Number of body layers
-Whether or not the animal has a backbone
-Symmetry and Body Plans
-Body Cavities
-Levels of organization
-Movement
-Segmentation
-Reproduction