“Tigers and lions, for example, are different enough to be regarded as separate species, but their hybrids, known as ligers and tigons, can sometimes be fertile.” “It’s possible that if their ...

Why Are Species ... different from those species that are already known (Figure 1), then you are faced with two questions. The first question is "what are species?", or to put it another way ...

A species is a group of living organisms that ... Instead they reproduce by dividing into two. To make things more complicated, they sometimes swap bits of DNA with distantly-related organisms ...

Classification attempts to impose a hierarchy on the complex and dynamic variety of life on Earth by describing how different species ... things into different groups we do this in order to try ...