Which nutrient is most commonly broken down for energy by the cell - is it carbohydrates or proteins?

Which organelle releases chemicals that break down large food particles into smaller ones?

During photosynthesis, hydrogen ions are most directly used to in the chloroplast pictured above. a) make glucose b) make chlorophyll c) produce carbon dioxide d) drive the production of atp

According to these anatomical structures which two animals are probably most closely related