One of the world's most poisonous fish toxins is released by

Options

A. Clown fish
B. Sword fish
C. Eel fish
D. Puffer fish

Answer

D

Explanation

Robert Grant (1857) was the first to recognise and prove the true animal nature of sponges. The animal nature of sponges was well established on the following grounds.
(i) Sponges feed on inwafted solide particles. Their mode of nutrition is truly holozoic.
(ii) Sponge cells of sponges include swimming ciliated larval stages resembling those of other marine animals. Sponges are sessile and digestion is very simple without any apparent way of capturing food or eliminating wastes.