Often a type of organ or body structure is the only physically feasible means of accomplishing a given task, so it should be unsurprising if, like eyes or wings, that type of organ or body structure evolves at different times in a number of completely unrelated species. After all, whatever the difference of heritage and habitat, as organisms animals have fundamentally similar needs and so __. Which one of the following most logically completes the last sentence of the passage? ['will resemble other species having different biological needs', 'will develop adaptations allowing them to satisfy these needs', 'will in many instances evolve similar adaptations enabling them to satisfy these needs', 'will all develop eyes or wings as adaptations']