12 June, 2024
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They have a simple body structure and lack specialised organs like a heart.
Credit: Pexels
They have a simple nervous system and lack both a brain and a heart.
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They are filter feeders and have no organs, including a heart.
Credit: Wikipedia
These microscopic creatures have a simple body plan and lack organs like a heart.
Credit: Wikipedia
These marine creatures have a water vascular system for movement and respiration, but no heart.
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While they have a digestive system, they do not possess a circulatory system with a heart.
Credit: Pexels