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ATS-Science 7

Invertebrates Vocabulary

TermDefinition
Animal A multicellular heterotroph whose cells lack cell walls
Bilateral Symmetry Body plan whose sides of the body mirror each other
Radial Symmetry Body plan whose body is organized around the center or the mouth
Asymmetry Has no symmetry or body plan
Invertebrate An animal that does not have a backbone
Porifera Phyla of sponges that are a sac of cells with many pores
Innate behavior An inherited behavior that does not depend on the environment or experience
Learned behavior A behavior that has been learned from experience
Sexual reproduction Reproduction involving two parents
Asexual reproduction Reproduction involving one parent
Open Circulatory System A circulatory system in which the fluid is not contained entirely within vessels
Closed Circulatory System A circulatory system in which blood circulates through vessels that form a closed loop
Nematocysts Stinging tentacles of a Cnidarian
Cnidarian Phyla of animals that have a central body cavity, one opening and tentacles that sting
Regeneration The ability of an organism to regrow lost body parts
Metabolism Creating energy from breaking down food
Exoskeleton A hard, external, supporting structure
Endoskeleton An internal skeleton made of bone or cartilage
Hibernation A period of inactivity and lowered body temperature some animals undergo in winter
Estivation A period of inactivity and lowered body temperature some animals undergo in summer
Mollusk An invertebrate with a soft body covered by a hard shell
Ganglion A mass of nerve cells
Segment An identical, or nearly identical, repeating body part
Circadian Rhythm A biological daily cycle
Metamorphosis A rapid change in the life cycle of animals from an immature to adult form
Created by: glink