List the three function of an arthropod exoskeleton

protection, support, and muscle attachment

Explanation:

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the national environmental policy act (nepa) is a united states environmental law that promotes the enhancement of the environment and established the president's council on environmental quality (ceq). the law was enacted on january 1, 1970. to date, more than 100 nations around the world have enacted national environmental policies modeled after nepa.

thinking it would be physical characteristics