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 AE is the flood insurance rate zone that corresponds with flood depths greater than 3 feet. Mandatory flood insurance purchase requirements apply. Zone AH is the flood insurance rate zone that corresponds to areas of shallow flooding with average depths between 1 and 3 feet.
Zone V: SFHAs along coasts subject to inundation by the 100-year flood with the additional hazards associated with storm waves. (Zone VE is used on new and some revised maps in place of Zones V1-30.) Zone A: SFHAs subject to inundation by the 100-year flood.