A) Annelida and Mollusca
B) Annelida and Cnidaria
C) Annelida and Ctenophora
D) Annelida and Arthropoda
Correct Answer: A
Solution :
The trochophore larva is minute, translucent and more or less pear-shaped structure. It also has a circle of cilia. It is found in molluscs and annelids with primitive embryonic development. This is a clear evidence that the annelids originated from molluscs.
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