Why are sponges considered as parazoa ​

Why are sponges considered as parazoa ​

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  1. A sponge is a member of the phylum Porifera. It is a simple animal with many cells, but no mouth, muscles, heart or brain. It is sessile: it cannot move from place to place the way most other animals can. A sponge is an animal that grows in one spot like most plants do.

  2. Plato Answer


    Animals are multicellular and so are sponges, because they have two distinct layers of cells. To fit the definition of an animal, they need to have animal-like cells. Sponges lack cell walls, which separate them from plants and fungi. Sponges are also eukaryotes, which fits the definition of an animal. Sponges need to take in food for energy, and they can’t photosynthesize. This fact separates them from green plants.

  3. Sponge parazoans are unique invertebrate animals characterized by porous bodies. This interesting feature allows a sponge to filter food and nutrients from water as it passes through its pores.

  4. Explanation:

    Because evidence (anatomical and genetic, if I’m not mistaken) gathered in recent decades show that the eumetazoa is a monophyletic group (they have one common ancestor from which the entire group derives, while the sponges don’t.

  5. Sponges are often considered an evolutionary dead end because they are so specialized in pumping water through their bodies that it is considered impossible to be modified into anything else. Although sessile, sponges can change their shape and grow towards water rich food.

    Explanation: please give brainliest!

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