Classification of Animals
Question
Which of the following characteristic features holds true for all the animals of the corresponding group?
Moderate
Solution
All echinoderms are marine. In Platyhelminthes, hooks and suckers are present only in parasitic forms; absent in free-living forms. Most sponges are asymmetrical. Some are radially symmetrical. In Coelenterata, only coral animals secrete calcareous exoskeleton.
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