PLEASE HELP ASAP Identify two mechanisms of recombination that take place during meiosis. Explain how each contributes to an increase in the genetic variation of a population.

Write the balanced chemical equation forphotosynthesis.

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.

Are the layers of rock above and below the coal older or younger?