Zinc is a chemical element with an atomic number of 30. zinc is slightly brittle at room temperature and looks gray in color.
A freshwater fish from the minnow family of the Cypriniformes order. Originally from South Asia, and is a common aquarium fish. In biological studies, zebrafish is a widely used vertebrate model organism. The Zebrafish genome is fully sequenced, and allows for easy genetic manipulation. They also carry external fertilization, rapid growth and a nearly transparent embryo making it an excellent model for physiological and human disease research.