Speciation is often used to claim that there are not distinct kinds. The claim assumes the kind is equivalent Species. This is not true.
The classification system used for organisms was developed by Carolus Linnaeus. He was a creationist, who tried to find the original kinds. He used the term species for what he thought were those kinds.
Species: a group of organisms that could interbreed among themselves, but not with another group.
His mistake was the failure to consider cross breeding. Unfortunately he named many species without using breeding experiments, based on such things as flower characteristics. Later he did extensive cross-breeding experiments. He then realized that his species concept was too narrow to be considered the created kinds. He then concluded that genus perhaps corresponded better and it has now been shown that a created kind can be one species or an entire family.
Following the flood, there would have been small interbreeding population groups. The gene pool of these groups would be limited and this would quickly producing many varieties with in kinds. This is because in small groups changes; from mutations, generic recombination, and Natural Genetic Engineering; are more likely to survive and spread through out a population. It is these varieties that are now known as species.
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