Question

Give reason the respiratory surface of earthworm is its skin

Answer 1

Answer:

because there are holes in his body which allows air to pass so the respiratory system is skin only

Answer 2

Answer:

Earthworms do not have specialized respiratory organs like we do; instead, they take in oxygen and expel carbon dioxide directly through their skin. Oxygen diffuses through the earthworm's body surface and diffuses inward to the network of capillaries lying just under the body surface