Which of the following are roles that ions play in living things? Maintaining an acid/base balance in an organism

maintain the balance of water in cells

regulate what substances cross cell membranes

help regulate your heartbeat

Which of the following options describes photosynthesis correctly? question 8 options: a plant uses carbon dioxide and water to make oxygen and nitrogen a plant breaks down sugar to make carbon dioxide. a plant uses sunlight, carbon dioxide, and water to make sugar and oxygen. a plant uses sunlight to break down sugars for digestion into water and oxygen.