Question

(iii) Which animal has thorns of calcium carbonate on its body?
a) lungh fish b) snail c) sponge d) starfish​

Answer 1

c) sponges it cansist of calciun carbonate

Answer 2

Answer:

c) sponges

because sponges belongs to phylem Porifera and all aminals which belongs to Porifera have a hard outer covering made up of calcium carbonate.

But, b) snail's shell is also made of calcium carbonate.

HOPE THIS HELPS !!!