How have humans offset the balance of the carbon cycle
(explain how you got that letter choice)
a. cutting trees which increase the amount of carbon available for food/
b. cutting trees which will increase carbon dioxide in the atmosphere.
c. cutting trees which reduces available oxygen for humans.
d. cutting trees which will reduce water in the atmosphere.

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.