Phylum annelida resembles mollusca in embryonic features because both have

Options

A. Spiral cleavage and mesoderm formation
B. Identical conspicuous segmentation in body, muscles and nervous system
C. Meroblastic cleavage and ectoderm formation
D. Special type of mouth parts

Answer

A

Explanation

A cleavage pattern characteristic of invertebrate as annelid and molluscans in which the cleavage planes are oriented obliquely to the polar axis of zygote.