Answer:
The body of earthworm
can be distinguished into dorsal and ventral sides due to thepresence of
certain peculiar feature in it like.
(i) The dorsal
surface is darker then ventral surface because it is marked by a darkmedian mid
dorsal line along the longitudinal axis of body. This is due to dorsal
bloodvessel, seen through integument.
(ii) The
ventral surface genital openings (pores), both male and female.
(iii)
Genital papilla is located on ventral surface and help in copulation.
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