Many features distinguish modern humans from the nonhuman apes. however, only two of these features define hominins. why?
a. proper taxonomic groups are always defined by the traits that all members of the group share.
b. the evolution of hominins involved several different changes that happened at different times.
c. only two of these features evolved early enough to apply to all the hominins.
d. proper taxonomic groups are always defined by the t