Introduction to Animals
An animal with a backbone
A characteristic that improves an individual's ability to survive and reproduce in a particular environment.
An animal without a backbone
A group of similar cells that perform the same function.
A collection of tissues that carry out a specialized function of the body
Body plan in which body parts repeat around the center of the body.
Body plan in which only a single, imaginary line can divide the body into two equal halves.
Process by which organisms maintain a relatively stable internal environment.
Animals with a notochord, most have a backbone.
A flexible rod that supports a chordate's back
Bones of the spinal column
An animal whose body does not produce much internal heat
An organism that is internally warmed by a heat-generating metabolic process
An invertebrate animal that uses stinging cells to capture food and defend itself.
Filter feeders without true tissues or organs
soft bodies, shells, muscular feet
animal with jointed legs and hard outer body covering that makes up the largest group of invertebrates.
A hard, external, supporting structure.
An internal skeleton
A phylum of marine invertebrates that are radially symmetrical. Includes starfish, sea urchins and sea cucumbers
An ectothermic vertebrate that breathes through gills and lives in water.
A connective tissue that is more flexible than bone
ectothermic animal living on both land and water
Any of a class of coldblooded chordates that breathe through lungs and have dry, scaly skin and lay eggs on land
An endothermic vertebrate that is covered in feathers, breathes through lungs and lays hard-shelled eggs.
endothermic vertebrates that have skin covered with fur or hair, and a four-chambered heart
Specialized organs in mammals that produce milk to nourish the young
Egg laying mammals
Mammals whose immature offspring complete their development in an external pouch.
a mammal that develops inside its mother's body until its body systems can function independently
A structure that allows an embryo to be nourished with the mother's blood supply
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