Which of the following organisms lacks a coelom?
A. roundworms
B. segmented worms
C. clams
D. grasshoppers
E. people
Answer (2)
it's A. Coelom "starts" in segmented worms.
The organism that lacks a coelom is A. roundworms, as they are classified as pseudocoelomates. In contrast, segmented worms, clams, grasshoppers, and humans are all coelomates. Roundworms possess a body cavity that is not completely lined by mesoderm, distinguishing them from the others listed.
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