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Why amoeba and paramecium do not have a proper circulatory system?

Amoeba and paramecium not have proper circulatory system because paramecia and amoeba are single-celled animals, and in order to have organs you need to be multicellular (organs are made of cells). They have to make do with organelles, like the nucleus and mitochondria.
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Because they have direct contact with the environment, so they don't need a circulatory system
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They r unicellular
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They don't possess blood because they have water for them which carries the nutrients to their body and gets the unwanted materials from their body. this process is diffusion
 
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because they are unicellular organisms
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Because they are single celled organism or unicellular organisms
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Because they are single celled or unicellularorganisms
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