A number of examples are given to show that there is no definition of the term "species" applicable to resolve questionable cases. Taxonomists disagree among themselves and change their minds as to what is a species and how many there are in various genera. As an evidence of evolution, taxonomy has a problem with gaps similar to the problem in the fossil record. Hereditary changes within species may represent "natural selection" but not evolution. Since the term species cannot be adequately defined it is not proper to say that creationists believe each species was created separately.