Which group of plants is most adapted to live in regions where the layer of soil beneath the surface stays frozen all the time? a) epiphytes that grow on trees b) trees whose roots run deep into the soil c) mosses, lichen, grasses, and small shrubs d) the saguaro cacti, which have fleshy stems

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.