Animals With No Heart

12 June, 2024 Credit: iStock

Flatworms (Platyhelminthes)

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Jellyfish

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Sponges

[{"selector":"#anim-3c63f154-4560-4300-ae44-2c117c5f0560","keyframes":{"opacity":[0,1]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-e9911ae9-864e-477b-b5f6-acd1e9a8c1d2","keyframes":{"transform":["translate3d(0px, 313.56201%, 0)","translate3d(0px, 0px, 0)"]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-6fddb95a-c8c8-4121-8a3b-b2e86270e308","keyframes":{"opacity":[0,1]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-ecf3450b-dae7-4265-8d88-56061496db67","keyframes":{"transform":["translate3d(0px, 854.24802%, 0)","translate3d(0px, 0px, 0)"]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-a1c3d138-ca62-4cc8-b3ca-2f17311b2473","keyframes":{"opacity":[0,1]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-865079b8-e25d-48dc-8e5d-a6487eb95734","keyframes":{"transform":["translate3d(0px, 836.20085%, 0)","translate3d(0px, 0px, 0)"]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-9f49e7d7-5995-4527-8f29-b9e834745d18","keyframes":{"opacity":[0,1]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-eabf4f99-953c-48af-bd1f-a08a7c1132b7","keyframes":{"transform":["translate3d(0px, -748.24954%, 0)","translate3d(0px, 0px, 0)"]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] They are filter feeders and have no organs, including a heart. Credit: Wikipedia

Tardigrades (Water Bears)

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Sea Urchins

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Roundworms

[{"selector":"#anim-8e4e714e-373b-407c-ac6f-54e3160b9059","keyframes":{"opacity":[0,1]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-defc2250-30fe-46ba-975c-0c1f38176a36","keyframes":{"transform":["translate3d(0px, 223.58020%, 0)","translate3d(0px, 0px, 0)"]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-8136a2a1-4623-4acd-afcc-99120abc560e","keyframes":{"opacity":[0,1]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-7cfc2879-3241-43b1-b3c9-4d3934b8ed3f","keyframes":{"transform":["translate3d(0px, 595.42462%, 0)","translate3d(0px, 0px, 0)"]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-582dce3b-496f-4bc9-bc9e-d941f7f37f4f","keyframes":{"opacity":[0,1]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-c3961590-ae82-4618-9cbb-27b27c377dbf","keyframes":{"transform":["translate3d(0px, 836.20085%, 0)","translate3d(0px, 0px, 0)"]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-f0e07f07-7bc0-4829-ac68-1f2fd46e64e6","keyframes":{"opacity":[0,1]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-3aaf0790-9121-4707-b198-0c6724d88524","keyframes":{"transform":["translate3d(0px, -748.24954%, 0)","translate3d(0px, 0px, 0)"]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] While they have a digestive system, they do not possess a circulatory system with a heart. Credit: Pexels

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