Internal. The ultimate sources of variation, the source of new heritable characteristics in populations and species, are due to mutation and recombination in chromosomes, genes, DNA.
Zone VE is the flood insurance rate zone that corresponds to coastal areas that have additional hazards associated with storm waves. Mandatory flood insurance requirements apply. Zone X and Zone X-500 are flood insurance rate zones that are outside the flood plain or with average flood depths of less than 1 foot.
What Is Flood Zone AE? The Federal Emergency Management Agency determines flood risk for the United States, then creates maps to clearly show the geographic areas prone to flood. The designation AE indicates areas at high risk for flooding and provides the base flood elevations (BFEs) for them.