This web site includes a page about crayfish, earthworms, and humans. It offers information about the systems of each organism.

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This web site gives information and images about the systems and anatomy of 3 organisms. Two of these organisms are crayfish and earthworms, and on their pages their systems will be compared to those of a humans. All of these organisms are part of the Kingdom Animalia, but yet are so different and so alike in many ways. On each page there will be information about the general characteristics, skeletal system, circulatory system, respiratory system, digestive system, and nervous system.