By Sheetal Kumari | July 2, 2025
These ancient animals depend on currents of water to bring them nutrients, living happily ever after without a heart.
(Image: Canva)
Flatworms take in oxygen directly through their bodies, with no heart or blood needed to live.
(Image: Canva)
Sponges contain porous bodies, using water filtration for oxygen and nutrients—no heart necessary.
(Image: Canva)
Corals exist by living in colonies, taking in nutrients from symbiotic algae with no heart needed.
(Image: Canva)
Starfish have a water vascular system to move and feed, no blood or heart.
(Image: Canva)
These strange animals circulate water through their bodies for nutrients instead of a heart.
(Image: Canva)
Residing within hosts, tapeworms draw nutrients directly and have no need for a circulatory system.
(Image: Canva)
Hydras draw oxygen in through their thin skin and have no heart, lungs, or blood.
(Image: Canva)
These gelatinous animals crawl on minute cilia and live without a heart or blood.
(Image: Canva)
Small marine colonies strain food and oxygen from water directly, with no need for a heart.
(Image: Canva)