By Archisha Yadav | November 27, 2024
Jellyfish pump nutrients and oxygen throughout their body without a heart. Their thin skin and simple anatomy help them absorb what they need directly from water.
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Flatworms lack a circulatory system and a heart. Instead, their bodies distribute oxygen and nutrients through direct diffusion across the skin.
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Starfish use a water vascular system for movement and nutrient distribution. This system eliminates the need for a heart or blood to circulate.
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Brittle stars, relatives of starfish, use their water vascular system to move and distribute nutrients, making a heart unnecessary for their survival.
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Sea sponges rely on water flowing through their porous bodies to transport oxygen and nutrients, removing the need for a heart or circulatory system.
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Corals absorb nutrients from surrounding water using their polyps. They do not need a heart as their simple structure handles all essential functions.
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Cnidarians, like hydra and sea anemones, absorb oxygen and nutrients directly from water, making a heart unnecessary for survival.
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Tapeworms live in host intestines, absorbing nutrients directly from their environment. Their simple bodies do not require a heart or circulatory system.
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Earthworms do not have a traditional heart. Instead, they have five aortic arches that pump blood, serving a similar function in their body.
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Planarians have a flat body structure that allows for diffusion of nutrients and oxygen, eliminating the need for a heart or blood vessels.
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