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28. Hard calcium carbonate structures are used as skeleton by : (a) Echinodermata (b) Protochordata (c) Arthropoda (d) Nematoda

28. Hard calcium carbonate structures are used as skeleton by :
(a) Echinodermata
(b) Protochordata
(c) Arthropoda
(d) Nematoda

Grade:12th pass

1 Answers

Pawan Prajapati
askIITians Faculty 60782 Points
2 years ago
Ans : (a) Echinodermata

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