You are given an unknown animal to study in the laboratory. It is long and ribbonlike and appears to have some repeating units. You find it has three tissue layers, it does not have a digestive tract,

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asked Nov 22, 2021 153k views

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You are given an unknown animal to study in the laboratory. It is long and ribbonlike and appears to have some repeating units. You find it has three tissue layers, it does not have a digestive tract, and it has male and female reproductive structures in the same individual. This animal probably is __________.