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(A) The dorsal surface of an earthworm is characterized by the presence of a dark mid-dorsal line,which represents the dorsal blood vessel visible thr

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Presence of genital pores $\quad\quad$ Dark mid-dorsal line

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(A) The dorsal surface of an earthworm is characterized by the presence of a dark mid-dorsal line,which represents the dorsal blood vessel visible through the skin.The ventral surface is identified by the presence of genital pores and the absence of the dark mid-dorsal line.Therefore,the ventral surface is marked by genital pores,and the dorsal surface is marked by the dark mid-dorsal line.

Column-$I$	Column-$II$
$1$. Spermathecae	$a$. $6^{th}$ to $9^{th}$ segments
$2$. Typhlosole	$b$. $1^{st}$ to $3^{rd}$ segments
$3$. Buccal cavity	$c$. $26^{th}$ to $35^{th}$ segments in intestine
$4$. Pharyngeal nephridia	$d$. $4^{th}$ to $6^{th}$ segment

Identify the correct option to distinguish between the dorsal and ventral surfaces of an earthworm.
Ventral surface $\quad\quad\quad$ Dorsal surface

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Identify the correct option to distinguish between the dorsal and ventral surfaces of an earthworm.Ventral surface $\quad\quad\quad$ Dorsal surface