Concept explainers
To explain: The reason why the sea daisies or concentricycloids were classified as echinoderms, and not as the members of a new phylum.
Introduction: Animal phylogeny is the rapidly changing field for the biologists. Even the members of animal kingdom are incredibly diverse, there are various animals sharing certain features that resemble them from other organisms of the kingdom.
To propose: A hypothesis is how sea daisies feed or move around.
Introduction: Animal phylogeny is the rapidly changing field for the biologists. Even the members of animal kingdom are incredibly diverse, there are various animals sharing certain features that resemble them from other organisms of the kingdom. Sea daisies are small, circular animals and are related to sea star. They belong to the phylum echinoderms.

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