SPAL
Why does it not make sense? You also have the time-line a little off As the evidence stands this chart approximates the dates of life in orderr of their appearance.
Millions of Years Since
First Known Appearance
(Approximate)
Microbial (procaryotic cells) 3,500
Complex (eucaryotic cells) 2,000
First multicellular animals 670
Shell-bearing animals 540
Vertebrates (simple fishes) 490
Amphibians 350
Reptiles 310
Mammals 200
Nonhuman primates 60
Earliest apes 25
Australopithecine ancestors of humans 4
Modern humans 0 .15 (150,000 years)
It is obvious that life does require time to accomplish the stages neccesary to the development of complex creatures such as ourselves but once the multicellular level is reached the process is quite accelerated and this does make sense.