Question

Why animal group posses (a) ear pinna (b) spini brons and radial symmetry

Answer 1

Answer:

1. Some of the marine bodies mostly invertebrates such as starfishes, urchins and sea cucumbers have spiny body and radial symmetry. They all come under a phylum called Echinodermata.

2. Some animals which have light bones that are hollow and are vertebrates such as ostriches, woodpeckers, etc. They come under the phylum called Chordate.  

3. Some of the invertebrate animals which are protected by calcareous shell that lack in symmetry like snail, mussels and oysters have soft bodies. They come under a phylum called Mollusca.

Explanation:

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