Earthworm has five hearts=
Earthworm hearts in action click on the link below =
http://academic.scranton.edu/faculty/can...
Colored diagrams on the link below = click onit =
http://cache.eb.com/eb/image?id=72114&re...
http://www.nrwmg.vic.gov.au/images/ana1....
Lion
Fish are the animal group that have two-chambered hearts. Reptiles and amphibians have three-chambered hearts and mammals have four-chambered hearts.
The animal with the smallest heart is the fairyfly, a type of parasitic wasp. Their heart is so small that it can only be seen under a microscope. Despite its small size, the fairyfly's heart is still able to pump hemolymph (insect blood) throughout its tiny body.
Dogs have the largest hearts compared to the size of the rest of their bodies. This applies to all breeds of dogs.
all of them hydra & worms dose not have liver
Well, both birds and mammals have four heart chambers. So, there is your answer!
As far as i know there's only one species of animal that does not have a heart and that is a jellyfish.
If your talking about an animal or a human heart they both came to exist the same way. god jehova created every living human and animal with a heart.
Natalie Owings has written: 'The Heart and Soul Animal Sanctuary' -- subject(s): Heart and Soul Animal Sanctuary, Animal rescue
It is the blue whale with a heart weighing about 600kg.
The blue whale has the biggest heart in the world
Octopus
Roadkill
The land animal which has the strongest heart is a horse. This is what makes it possible for horses to race.
Busty Heart was born on May 9, 1961, in Boston, Massachusetts, USA.
Fish
jellyfish