Pair of hearts present in earthworm are (a) One (b) Two (c) Three (d) Four
Option d) An earthworm has four pairs of tubular hearts. These hearts are thick-walled, enlarged and have valves. In the 7th and 9th segments, two pairs of the heart are present on the anterior side and are known as lateral hearts. These lateral hearts connect the dorsal blood vessel with the ventral blood vessel.
