earthworms

[mackemdave]

how many hearts does an earthworm have

[bernardo]

eleven

[wildwood]

Earthworms have five muscular aortic arches that function as hearts by pumping blood by alternate contractions, though not true hearts.

[bernardo]

oops - I think eleven is the number of brains, not hearts. And I might be thinking of something else, not an earthworm.

[firefly]

It's a bit academic to confuse earthworms' brains and hearts, as nothing less complex than a fish has either.