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11.1: Invertebrate Characteristics

Difficulty Level: At Grade Created by: CK-12
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Vocabulary

appendage

Limbs, such as legs or wings.

brain

Central nervous system organ inside the skull; the control center of the nervous system.

complete digestive system

Digestive system consisting of a digestive tract and two body openings (mouth and anus).

fission

Type of asexual reproduction that occurs when an animal simply divides into two parts.

incomplete digestive system

Digestive system that consists of a digestive cavity and a single opening that serves as both mouth and anus.

larva

(plural, larvae): Juvenile stage that occurs in the life cycle of many invertebrates, fish, and amphibians and that differs in form and function from the adult stage.

nerve net

The simplest invertebrate nervous system; a network of nerves that can sense touch.

nervous system

Organ system that carries electrical messages throughout the body.

invertebrate

Animal that lacks a vertebral column, or backbone.

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Difficulty Level:
At Grade
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Date Created:
Feb 24, 2012
Last Modified:
Sep 04, 2016
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