Assertion (A): Much like humans,
annelids have a closed circulatory
system.
Reason (R) the blood circulates
through a closed network of blood
vessels& the heart-like structures in
the earthworm are called aortic arches,
which pump blood out into the
network of vessels that run in a circuit
through the body...
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While these species look quite bland, they have unique circulatory systems. ... Much like humans, annelids have a closed circulatory system, which means the blood circulates through a closed network of blood vessels. ... structures in the earthworm are called aortic arches, which pump blood out into the network of vessels. the earthworm has a closed circulatory system. A closed circulatory system means that the blood is confined to blood vessels and its blood recirculates so it gets maximum use. The worm uses its bodies suface area to absorb oxygen from the soil instead for using lungs or gills.
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