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.
Hydrazine, N2H4, is a molecule in which one hydrogen atom in NH3 is replaced by an âNH2 group. The pure compound is a colourless liquid that fumes with a slight odour similar to that of ammonia. In many respects it resembles water in its physical properties.