Why is it essential for a balance to exist between the sympathetic and parasympathetic nervous systems?.

Development of new communities in disturbed environments, such as a burned or a clear cut forest, is called

What type of competition exsist between two species. turtles and fish

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.