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Sponges and hydra are very small organisms. These organisms don't need much energy for their daily processes. These organisms don't even need a partner to reproduce. These organisms have a very simple structure and the process of transfer of food in body isn't required.
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Sponges and hydra are made up of cells only . They have
Very small no. of tissues in them. As we know that blood is a tissue, to have blood organism's body has to be differenciated upto tissue level.

Hope my answer helps u
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