Life Science-Chapter 10

Animal Classification

Symmetry

The property of an object that means that it can be divided by one or more imaginary lines into mirror-image halves.

Notochord

A flexible rod found in chordate animals.

Vertebrate

An animal that has a backbone.

Invertebrate

An animal that lacks a backbone.

Endotherm

An animal can regulate its internal body temperature.

Ectotherm

An animal with a body temperature that is determined by its environment.

Baraminology

The effort to define the boundaries between the various kinds of animals.

Baraminology

The efforts to define the boundaries between the various created kinds of animals

Cnidarian

One of a group of animals with stinging cells, called cnidocytes, including jellyfish.

Echindotherm

One of a group of animals with spiny skin, including sea stars, sea urchins, and sea cucumbers.

Mollusk

One of a group of animals with soft bodies and usually a shell, including snails, octopuses, and clams.

Arthropod

One of a large group of animals with jointed appendages and an exoskeleton.

Exoskeleton

A support structure on the outside of the animal’s body.

Endoskeleton

A living internal support structure.

Amphibian

An ecdothermic vertebrate that usually lives in water when young and on land as an adult.

Placental Mammal

A mammal that provides its embryo with oxygen and food through a structure called placenta.

Marsupial

A mammal with a pouch in which to raise its young.