A student studies photosynthesis and cellular respiration in plants. He observed that 15 grams of glucose and oxygen is produced. Explain which process he observed and how much of the reactants were needed to create the 15 g of glucose and oxygen

italy's population growth rate is almost at zero, the national statistics agency, istat, said on monday, mainly due to a dwindling birth rate.

only about ten percent of the energy at one trophic level is passed on to organisms at the next trophic level. the remainder of the energy is used in life processes or lost as heat.