If Echinoderms Are Radially Symmetrical,why Are They Not in the Same

question 53

Multiple Choice

If echinoderms are radially symmetrical,why are they not in the same phylum as the cnidarians?

• A)Echinoderms branched from cnidarians,but are considered more advanced because they also gave rise to chordates.
• B)The echinoderm larvae are originally bilaterally symmetrical but metamorphose into a radially symmetrical adult.
• C)Radial symmetry is maintained as a primitive state by all animals in the embryonic stage and can appear anywhere.
• D)Echinoderms are the most primitive of the deuterostomes and evolution begins in each group with radial symmetry.
• E)Echinoderms have a five-sided bilateral symmetry that just appears to be radial.

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