Zinc (Zn) is a bluish-white metal of low to intermediate hardness that melts at 419°C and is estimated to comprise about 0.013% of the earth's crust. Zinc is an essential element for human health; over 200 enzymes in the body require zinc for proper functioning.
Zoology is the study of ANIMALS. Zoologists have many interests: some study form (morphology) or function (physiology), from gross to molecular levels; behaviour (ethology); association (ecology); or distribution (zoogeography); and some specialize in one kind of animal.
Zoos or zoological gardens are facilities exhibiting wild and domesticated animals for purposes of education, recreation, conservation and research. Zoological gardens can be conventional, dense-occupancy zoos to open animal parks and game farms.