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.
A flood zone is a geographical area shown on a flood map (FHBM - Flood Hazard Boundary Map or FIRM - Flood Insurance Rate Map) that reflects the severity or type of flooding that may occur in the area.