What are the requirements for photosynthesis to occur, and what is the role of atp in this reaction?

How does the study of genetic disorders such as pku biologists understand normal alleles?

Eutrophication caused by human nutrient pollution.

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.