The oxygen produced by plants is a by-product of
the light-dependent reactions
the light-independent reactions
the krebs cycle
glycolysis
fermentation

When does the circulatory system work with the respiratory system? a. during blood cell formation b. during cellular respiration c. during intestinal digestion d. during a viral infection

Which layer will become saturated first when rain falls?

Drag each tile to the correct box. arrange the layers and faults from oldest to youngest.