Which of the following correctly lists organisms from least complex in overall development to most complex?

Question

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Sponges are the simplest form of multicellular organisms, lacking true tissues and organs. Hydras are more complex, with a simple body plan that includes a mouth and tentacles. Clams, being mollusks, have more complex structures including a heart, digestive system, and a nervous system, making them more complex than both sponges and hydras.

Which of the Following Correctly Lists Organisms from Least Complex