We must actually ingest them from food products. And we need all 20 amino acids to basically survive, even if we are missing a single amino acid. That means we do not have the proper amount of amino acids in our body to synthesize all the proteins that are needed by the body to survive. So we need all these 20 amino acids to basically live on and survive and function effectively and efficiently. Finally, let's move on to the final organic type of macromolecule known as lipid. Now, by the way, organic simply means that it contains carbon.