Do all animals have hearts, even the microscopic ones?
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No. Many animals have no heart or even a separate circulatory system. In very small animals there's no need for an organ to transport nutrients through the body; diffusion is sufficient. Most of the major groups of animals (phyla) do not have hearts. Sponges have no hearts. They have no organs at all. read more
No. Many animals have no heart or even a separate circulatory system. In very small animals there's no need for an organ to transport nutrients through the body; diffusion is sufficient. Most of the major groups of animals (phyla) do not have hearts. Sponges have no hearts. They have no organs at all. read more
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