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ï§Carbon-based molecules are called organic compounds. ï§â¯By sharing electrons, carbon can ââ¯bond to four other atoms and ââ¯branch in up to four directions. ï§â¯compounds composed of only carbon and hydrogen are called hydrocarbons. ï§â¯A carbon skeleton is a chain of carbon atoms that can be ââ¯branched or ââ¯unbranched.
From the smallest single-celled organism to the tallest tree, all life depends on the properties and reactions. of four classes of organic (carbon-based) compoundsâcarbohydrates, lipids, proteins, and nucleic. acids. These organic molecules are the building blocks of all living things, and are responsible for most of.