Animals with backbones
Vertebrates
Animals without backbones
Invertebrates
An organism that eats other organisms or organic matter
Consumer
A mass of nerve cells
Ganglion
The digestive tract
Gut
A body cavity that contains the internal organs
Coelom
Symmetry that is the same when it is split in the middle
Bilateral Symmetry
Symmetry around a certain point, like a starfish
Radial Symmetry
A lack of symmetry to a certain point on a animal
Asymmetry
A phylum that has Asymmetry and water flows into cavities that bring in food and oxygen
Sponges
A phylum that includes jellyfish, and sea anemone; they have radial symmetry
Cnidarians
A worm with a flat body, no blood vessels, and a one opening digestive tract
Flatworms
A parasitic worm found in the intestines of mammals
Roundworms
A phylum that contains snails, slugs, and octopuses; they have soft unsegmented bodies
Mollusks
A circulatory system in which the circulatory fluid is not contained entirely within vessels; a heart pumps fluid through vessels that empty into spaces called sinuses
Open Circulatory System
A circulatory system in which the heart circulates blood throughout a network of vessels that form a closed loop; the blood does not leave the blood vessels, and materials diffuse across the walls of the vessels
Closed Circulatory System
A phylum that contain the segmented worms
Annelid Worms
Any part of a larger structure, such as a the body of an organism, that is set off by natural or arbitrary boundaries
Segment
A hard, external, supporting structure
Exoskeleton
An eye composed of many light detectors
Compound Eye
A feeler that is on the head of an invertebrate , such as a crustacean or an insect, and that senses touch, taste, or smell
Antenna
A phase in the life cycle of many animals during which a rapid change from the immature form of an organism to the adult form takes place
Metamorphosis
An internal skeleton made of bone and cartilage
Endoskeleton
A system of canals filled with a watery fluid that circulates throughout the body of an echinoderm
Water vascular system