Leech is:

Which animal has the respiratory pigment $Hb$ (hemoglobin) dissolved in its blood plasma?

$A$ student was given a specimen to identify on the basis of the characteristics given below.
$(i)$ They are metamerically segmented.
$(ii)$ Presence of closed circulatory system.
$(iii)$ They have circular and longitudinal muscles for locomotion.
Identify the specimen.

Earthworm is placed in the group

Suctorial mouth occurs in

Select the correct option:
$(1)$ Annelids are the first animals to possess a circulatory system.
$(2)$ The heart is called myogenic.