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.
Floods: Flood Zone - Which One Are You In. Home >> Perils >> Floods >> Flood Zone - Which One Are You In. The Federal Emergency Management Agency (FEMA) has placed more than 20,000 communities in the United States into a category of flood zones. Each community is able to participate in the agency's National Flood Insurance Program (NFIP), with premium rates determined by the risks of flooding.