Q.How do earthworms breathe?

Step 1. The earthworm has no lungs, gills, or any other dedicated respiratory organ.

Step 2. Instead, its entire outer body surface functions as the respiratory organ, a process called cutaneous respiration.

Step 3. The skin is richly supplied with blood capillaries lying close to the surface, so dissolved oxygen from the surrounding soil moisture or water film diffuses directly into the blood, while carbon dioxide diffuses out in the opposite direction. …

Recall that the earthworm has no dedicated respiratory organ and instead breat …

• Assuming earthworms must have some internal breathing organ simply because they are relatively large, complex animals. …