Students in a class measured the mass of various living organisms. They then kept the organisms in the dark for 24 hours before remeasuring them. None of the organisms were provided with nutrients during the 24-hour period. The data are as follows. Which of the following is the best explanation for the pattern of change in mass of the organisms over time? i. Water loss due to evaporation
ii. Cellular respiration
iii. The law of conservation of matter
iv. Growth and reproduction