Question

in which of the following gaseous exchange between O2and CO2 occurs through general body surface. ans 1 spong 2 coelenterates 3 flatworms 4 all​

Answer 1

Answer:

4 OPTION IC CORRECT

Explanation:

Answer 2

(i) Direct respiration : It is the exchange of environmental oxygen with the carbon dioxide of the body cells without special respiratory organs and without the aid of blood. It is found in aerobic bacteria, protists, plants, sponges, coelenterates, flatworms, roundworms and most arthropods.