The excretory organ in the earthworm is ________

Explanation

In Biology, excretory organs are responsible for removing waste products from the body. The question is asking us to identify the excretory organ in the earthworm. The options provided are Malphigian tubule, Stoma, Nephridium, Flame cells, and Gills. We need to choose the correct option that represents the excretory organ in the earthworm. Option A, Malphigian tubule, is the excretory organ found in insects, not earthworms. Option B, Stoma, is responsible for gaseous exchange in plants, not earthworms. Option D, Flame cells, are found in the excretory system of flatworms, not earthworms. Option E, Gills, are respiratory organs in aquatic animals, not earthworms. Therefore, the correct answer is Option C, Nephridium. Nephridia are the excretory organs in earthworms responsible for filtering waste products from the coelomic fluid and excreting them through pores called nephridiopores located on the body wall. Understanding the excretory system of earthworms is important in the study of animal physiology and helps us understand how different organisms have adapted to survive in their environments.