Livings things are organisms that can grow, replicate, and respond to environmental stimuli. Example: microorganisms, plants, animals, etc.
All living organisms are composed of chemical compounds.
Examples of chemicals found in living things:
Nucleic acids (DNA and RNA) are polymers of nucleotides. Each nucleotide is composed of sugar, phosphate, and a nitrogenous base.
Proteins are macromolecules that are present in abundance. They are composed of a long chain of amino acids.
Carbohydrates are important biomolecules that contain carbon, hydrogen, and oxygen. They can range from simple sugars (e.g., glucose) to complex polymers (e.g., cellulose).