Source: The San Tan Valley, AZ weather data displayed above is derived from the NOAA (National Oceanic and Atmospheric). Air quality and pollution data is derived from the EPA (United States Environmental Protection Agency).
A hydra is a small multicellular organism in the genus of the same name. These tiny animals are found in fresh water all over the world, and they have a number of distinctive traits that make them interesting to scientists.
Hydra - (Greek mythology) monster with nine heads; when struck off each head was replaced by two new ones; Hydra was slain by Hercules. Greek mythology - the mythology of the ancient Greeks. mythical creature, mythical monster - a monster renowned in folklore and myth. Snake.