In which animal did the eyes originate first?

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(D) The evolution of eyes is a significant milestone in biological history. Among the given options,$Planaria$ (a flatworm) is the first animal known

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Planaria

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(D) The evolution of eyes is a significant milestone in biological history. Among the given options,$Planaria$ (a flatworm) is the first animal known to possess primitive eyespots called ocelli. These structures are capable of detecting light and dark,allowing the organism to exhibit phototactic behavior. While $Paramoecium$ and $Plasmodium$ are unicellular organisms that lack complex sensory organs,and $Peripatus$ is a more complex arthropod-like organism,$Planaria$ represents the earliest evolutionary stage where rudimentary light-sensing organs appeared.

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