Title : Optionnel

Text : Why is recycling carbon important? Recall that carbon is the cornerstone of organic compounds, the compounds necessary for life. But do organisms make their own carbon? Do they have the genes that encode proteins necessary to make carbon? No. In fact, there are no such genes. Carbon must be recycled from other living organisms, from carbon in the atmosphere and from carbon in other parts of the biosphere. Chaque paragraphe sera un test.

Save test : Utilisez cette option si vous souhaitez partager ce test de dactylographie (uniquement pour les utilisateurs authentifiés).