Where are the intermediate species in the fossil record? Why can’t we make fruit flies evolve?
The geological record is actually SECTIONS of a biological continuum. The fossil species we find are sections out of that continuum. The continuum extends over a span of millions of years. There are "intermediate" species remains.
Look at the series we have on horses, primates, etc.
But you have to understand two things:
1) The likelihood any ANIMAL being fossilized is extremely remote. When you are dealing with animals whose popualtions were quite large, or lived over a very extended period of time, the chances of finding a fossil are enhanced.
2) Trying to trace the evolutionary development of any one modern species is difficult as lineages are not rectiliniar, they are bushlike. A lot of lineages died out after evolving in some direction without leaving any contemporary descendants. So you have a better chance of finding the fossil from a population of "cousins" of an existing species than you are of finding the fossil from a direct ancestral population.
Why can't we make fruit flies evolve?
We can make fruit flies with different characteristics from the ancestral fruit flies, but, no, we haven't been able to make a new species of fruit fly. Probably because speciation takes far longer than the average human life span and we haven't been at this business very long anyway.
We can't create life either, but that is no proof that it doesn't exist. Maybe only God can make evolution occur.