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Biological Evolution: Unity and Diversity: Vertebrates and Invertebrates
Flatworms
Description
Flatworms
Flatworms are simple, soft-bodied invertebrates that belong to the phylum Platyhelminthes. These animals have a flattened shape, which helps them absorb oxygen and nutrients directly through their skin, since they lack circulatory and respiratory systems. Flatworms can...
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Transcript
Ever seen a worm so flat it looks like a living ribbon? That’s a flatworm, a member of the phylum Platyhelminthes.
Flatworms are soft-bodied and bilaterally symmetrical, meaning their bodies can be divided into mirror-image halves. They don't have a body cavity, and their thin bodies allow direct gas exchange through the skin.
Their ...
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