Apologia Biology Module 12

Terms	Definitions
A body covering, typically made of chitin, that provides support and protection	Exoskeleton
To shed an old outer covering so that it can be replaced with a new one	Molt
The body region between the head and the abdomen	Thorax
The body region posterior to the thorax	Abdomen
A body region composed of the head and thorax fused together	Cephalothorax
An eye made of many lenses, each with a very limited scope	Compound eye
An eye with only one lens	Simple eye
A circulatory system that allows the blood to flow out of the blood vessels and into various body cavities so that the cells are in direct contact with the blood	Open circulatory system
The organ of balance in a crustacean	Statocyst
A general term for the organ that produces gametes	Gonad
Insect development consisting of four stages: egg, larva, pupa, and adult	Complete metamorphosis
Insect development consisting of three stages: egg, nymph, and adult	Incomplete metamorphosis
An exoskeleton, body segmentation, jointed appendages, a ventral nervous system, and an open circulatory system	General characteristics of arthropods

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