The leap from ape to man in terms of observable phenomena or artifacts is how big of a leap. Whats the smallest gap in years. Talk about faith. You may want to make the jump and go with the thought that what is true for invertabrates or even crustaceans is treansferable to man. If I had an analogous financial opportuntiy for you you would not invest a dime on such an obviously risky prospectus and certainly not bet your life. But it works if you want to rationalize something.