What percentage of the creatures that have ever lived do you suppose have been fossilized, and what percentage of existing fossils do you suppose have been found.
If you dig a hole at random, do you find large numbers of animal bones? If not, why not? Is it because animals have never lived where you are digging, or because the conditions necessary for fossilization are a bit unusual?
Oh c'mon now. Surely ye jest. It is quite obvious that I'm speaking of the percentage of fossils dubbed "transitional" (in the 'missing link' sense) as compared to the total of known fossils. Tis a problem for the evo crowd, of course, that the numbers don't add up.