Biology · Gaseous Exchange

Earthworms perform gaseous exchange through their moist skin, which allows oxygen to diffuse in and carbon dioxide to diffuse out. This process is efficient for their small size and habitat. Option A is incorrect because earthworms lack lungs. Option C is incorrect as the blood facilitates transport but not direct exchange. Option D is incorrect because nephridia are involved in excretion, not respiration.

Earthworms do not possess lungs; they rely on another method for gaseous exchange.

Earthworms utilize their skin for gaseous exchange, allowing oxygen to enter and carbon dioxide to exit.

While blood in earthworms helps transport nutrients and gases, the actual exchange of gases occurs through their skin.

Nephridia are responsible for excretion and osmoregulation, not for gaseous exchange.