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The general problem is that once you present a transitional specie to a creationist, they then demand a transitional specie between the previous specie to the just presented transititional specie.
And the transitional to the transtional and the transitional.
Get the picture?
Evolution does not proceed along a linear ladder from one species to the next; if it did, the missing link" would have a brain size of about 900cc (halfway between chimpanzee and modern) and be "halfway bipedal" (as it happens, bipedalism came first, then we saw major brain enlargment). This means we cannot predict exactly what a given ancestral species will look like in all its features; we can only specify which sets of features must have changed and make educated guesses about which ones changed together because they were functionally linked (say, jaw size and tooth size). Then we look for fossils to test our guesses, refine our theories, and go on.
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The problem with so called transitional forms is that every living organism is a transitional form, each generation is subtly different from its parents, so you will never find the half human, half ape "missing link", because the differences between generations is so minute as to be undetectable in the fossil record, except over vast amounts of time.
We can however, as MillerE has already pointed out, identify certain characteristics of the structure of fossilised remains to determine whether two idividuals were related or not.
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