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.
On NFIP maps, the base floodplain is called the Special Flood Hazard. Area (SFHA). The SFHA is designated as Zone A, AE, A1-30, AO, AH, V, VE. or V1-30 depending on the amount of flood data available, the severity of the. flood hazard, or the age of the flood map (see the discussion of zones in this Unit.