Heart is one of the important organs which is responsible for pumping and filtering the blood through out the body.
But there are some animals who don't have heart at all !!!
Most of them depend on diffusion.
Such animals are - - - - -
1. Flat worms
2. Jellyfish
3. Sponges
4. Hydra
5. Star fish
6. Sea urchins
7. Round worms
8. Tape worms
9. Sea cucumbers
10. Sea lilies
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