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.
It essentially states that you are in a flood zone and could potentially flood up to the BFE based on simulated models and hydraulic analyses, therefore regulations restrict you from doing certain things below the BFE. Mandatory flood insurance purchase requirements apply.