Explain platyhelminthes or echinodermata
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Answer: Platyhelminthes is a phylum of soft-bodied bilaterally symmetrical usually much flattened invertebrates comprising the planarians, flukes, tapeworms, and related worms, having the body unsegmented or composed of a series of proglottids formed by strobilation, built up of ectoderm, endoderm, and mesoderm, and without body cavity.
Any marine animal of the invertebrate phylum Echinodermata, having a radiating arrangement of parts and a body wall stiffened by calcareous pieces that may protrude as spines and including the starfishes, sea urchins, sea cucumbers, etc.
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Most of the flatworms live on or inside other animals as parasites, but a few are free, living in the sea fresh water. ... They are found mostly in sea, very few in fresh water. Examples : hydra, jellyfish, sea anemone,corals. The characteristics of Echinodermata are: They are unsegmented, marine aninals.
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