Final answer:
Carbon can form complex molecules with branching and three-dimensional variability due to its ability to form four covalent bonds with other atoms. This allows for the creation of diverse structures and functions in organic compounds.
Step-by-step explanation:
Carbon is a versatile element that can form four covalent bonds with other atoms, allowing for the creation of complex molecules with branching and three-dimensional variability. For example, carbon atoms can replace hydrogen atoms in methane to form long and branching chains of carbon compounds, or they can bond with atoms of other elements to create molecules with diverse structures and functions. This remarkable ability of carbon to form multiple bonds and create a wide variety of molecules is the basis of organic chemistry.
Learn more about Carbon compounds