Answer: Carbon can form single, double, and triple bonds is a characteristic of a typical carbon atom.Carbon is one of the most abundant and essential chemical elements on earth. Carbon has an atomic number of 6 and does not dissolve in water. Carbon is nonmetallic and tetravalent (has four valence electrons). Carbon atoms have the ability to form single, double, and triple covalent bonds with other atoms. Carbon atoms can bond together in various ways (allotropes) and they include graphite, diamond, and amorphous carbon.
Hormones because if you think about it. Vertebrates must have backbones and mammals have them. And, humans are basically mammals. And the glands secrete hormones.
