AIIMS 2019 Biology Platyhelminthes MCQ Question

Acoelomate animals, such as those in the phylum Platyhelminthes (flatworms), possess specialized excretory structures known as flame cells, which help in osmoregulation and excretion of waste products. In contrast, Annelida (segmented worms) have a coelom and utilize nephridia for excretion, while Ascheminthes (often referred to as nematodes) possess a pseudocoelom and rely on different excretory systems. Arthropoda, characterized by a coelom and jointed appendages, utilize Malpighian tubules for excretion, further distinguishing them from acoelomate organisms.