Why are resemblances due to convergence described as 'superficial'?

Resemblances due to convergence are described as 'superficial' because they arise when different species independently evolve similar traits or characteristics, often due to adapting to similar environmental pressures or ecological niches. Although these species may exhibit similar physical traits, such as body shape or size, the underlying genetic and evolutionary origins of these traits are distinct. For example, both bats and birds have developed wings that allow for flight, but they evolved from different ancestors and through different evolutionary pathways. This highlights that the similarity is not based on shared ancestry, but rather on convergent evolution adapting to similar functional requirements. This superficial resemblance does not reflect a close genetic relationship, emphasizing the importance of evolutionary context in understanding these traits.