In the photosynthesis experiments using different colored lights, why were the experimental volume changes subtracted from the controls to provide the photosynthetic rate?

The location of the stomach is the diaprham

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

All but one describes an effect of aging on the digestive system. a) decreased acid secretion b) decreased elasticity of stomach c) capacity to resist damage decreases d) food remains in stomach for less time