Topic content:
The following animals all live in the sea are ()
A. Coelenterate
B. Protozoa
C. Molluscs
D. Echinoderma
Best answer:
Protozoa, coelenterates, mollusks and echinoderms are invertebrates and all live in water. However, some protozoa, coelenterates and mollusks live in fresh water, some live in sea water, and only echinoderms all live in sea water, which is an important part of marine organisms. The body surface has spines for human consumption
Therefore: D
Answer analysis:
There is no explanation for this question
Test core:
Basis for animal classification: In addition to the external morphological structure, the classification of animals should also compare the internal structure and physiological function of animals, and combine the living habits and geographical distribution of animals. Animal classification: