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Unit 18: Biology Part 1 Page 5 of 60

Class : Group of similar living things in the same phylum or sub-phylum
Classify: Group; as in grouping organisms into hierarchical categories.

Cnidaria: Invertebrates that have radial symmetry and include the jellyfish.

Complete digestive tract: A digestive tract that has two openings, the mouth
and the anus.

Coral reef: Cnidarians that live on ocean reefs in colonies.

Cranium : Brain cavity

Cuticle: The outer layer of the exoskeleton.

Echinodermata: The phylum of the echinoderms; contains about 7,000 living
species, the largest phylum without freshwater or terrestrial members.

Echinoderms: Organisms in the phylum Echinodermata.

Ectothermic : Having a body temperature which changes based on the
outside temperature
Endoskeleton: A hard structure giving an organism shape found inside of the
organism; for example, the human skeleton.

Endothermic : maintaining a constant body temperature regardless of the

outside temperature
Estrus : The optimal time for females to become pregnant

Exocuticle: The thin and waxy water resistant outer layer of the cuticle.

Family: Organisms descended from the same ancestors sharing relatively
similar characteristics.

Flatworm: Worms lacking a body cavity found in the phylum
platyhelminthes.

Fledge : being able to fly on its own

Frugivore : fruit-eater

Gangla: A compact group of nerve cells having a specific function.
Gastric Mill: A gizzard-like structure for grinding food.

Gastrovascular cavity: A large cavity having both digestive and circulatory
functions.

Generalist : animal that will eat multiple types of food

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