which statement best explains why modern europeans, asians, or africans lack denisovan dna in their genome? a. denisovans never interbred with any population of homo sapiens. b. denisovans dna was eliminated from those populations by strong purifying selection. c. denisovans interbred only with the population whose ancestors are melanesians. d. neanderthal genes and denisovan genes are incompatible, so modern populations have one or the other.
