Earthworms have a closed circulatory system with multiple "hearts" that pump blood. These are not true hearts in the mammalian sense but rather muscular blood vessels that aid in circulation. They are typically arranged in three pairs, located in segments 7, 9, and 12.
How many pairs of heart exist in Earthworm ?
Asked in Government Polytechnic Exam 2012 · Topic: Circulatory System (Comparative Circulatory Systems in Animals (e.g., Fish, Amphibians, Reptiles, Birds, Mammals))
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