Trace amounts of impurity in a mineral can commonly produce significant differences in among individual crystals of a mineral.

Which of the following factors would not contribute to allopatric speciation? a) a population becomes geographically isolated from the parent population. b) the separated population is small, and genetic drift occurs. c) the isolated population is exposed to different selection pressures than the ancestral population. d) different mutations begin to distinguish the gene pools of the separated populations. e) gene flow between the two populations is extensive.

Which level of taxonomy has the fewest organisms?

Interferons play a vital role in the immune system why are interferons so important?