Social forces appear to have directed much of the evolution of humanity but we are still subject to natural selection.
Primate taxonomy (see books: phylogeny, taxonomy, systematics) is in a state of flux due to the discoveries made in primate genetics.
 Natural selection, gene flow and random genetic drift (the random change in gene combinations with each generation) drive evolution, resulting in a change in gene frequencies within populations .
 Adaptation is genetically based and so leads to phenotypic changes that accumulate over time;  Speciation (species formation) evolves through reproductive isolation and (genetic) divergence of populations;  Genetic changes through natural selection lead to new species and eventually new taxa .
This environment has a living (other animals) and non-living component (e.g. Widgets A unique adaptation usually precedes the entry into a new niche .
Tool use by our early ancestors is one such adaptation.
Only after this, did God breathe his Spirit into Adam.
There are thus two aspects of the human personality, the physical constitution and the spiritual constitution.
God first completed the physical and biological constitution of humanity.Living orders of placental mammals , be it bats, humanity, whales or camels, have as their common ancestor a small insectivore creature that went through a major phase of adaptive radiation during the Early Cenozoic Era .We humans are first animals, then mammals, then primates.Very simply, there are five basic principles to this theory:  Variation has a genetic origin (i.e.is heritable) and arises through processes such as mutation and recombination.Once multicellular organisation became possible as atmospheric oxygen levels rose, the early multicellular organisms rapidly diverged into many adaptive forms.