Translations:Adventist Youth Honors Answer Book/Nature/Worms - Advanced/24/en

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Coelomates have a complex body cavity. Organs are suspended from the body wall. Mollusks and humans are just a few of the animals that share this body structure. Pseudocoelomates have a simple fluid filled body. The organs of these simple animals often float within the body cavity. Nematodes are the most numerous members of animals that have this body structure. Acoelomates lack internal body cavities. Acoelomates include flatworms and ribbon worms. For example, flatworms have organs, but do not have a fully formed digestive tract or a way to transport oxygen through the body. Therefore, each cell is required to handle respiration individually. http://www.bookrags.com/Animal

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