(see reptiles and humans .) a herpetologist is a zoologist who studies reptiles and amphibians . contents overview of species systems circulatory system respiratory system digestion and excretory system nervous system and senses reproductive system reptiles and humans evolution of the reptiles classification...
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the surface of the body. a few animals which live parasitically originally had guts but have secondarily lost these structures. the original gut of multicellular organisms probably consisted of a simple sac with a single opening, the mouth. many modern invertebrates have such a system, food being ingested...