Why dose the hierarchy of organization in living things go from atoms to cells

An exothermic reaction is conducted in an insulated calorimeter filled with water. the calorimeter is then sealed so that there is no heat exchanged between the contents of the container and the surrounding air. which of the following statements is true about the reaction?

In this chemical reaction, 325 grams of barium (ba) react completely. how many moles of lithium (li) are produced?

What causes most sediment to wash or fall into a river