Alien-human hybrids are unlikely but not impossible, scientists say
What would biology say about that? What makes a species? It is intuitive for us to classify individuals based on their appearance. Thats how we differentiate a dog from a tree. But not all lookalike organisms belong to the same species. One example is the African fish eagle and the bald eagle. They look quite similar but they belong to different species. Dogs, on the other hand (paw? ), come in different colors, shapes, and sizes but they all belong to the same species....