¿Cuántos moles de O2, se requieren para reaccionar 8 moles de octano (C8H18)? 2C8H18 +25O2 16CO2+18H2O

An ecologist studied the same species of deer during the summer and the winter. she noticed that during the summer, when there was plenty of food, the deer were energetic and playful. however, during winter when food was scarce, the deer moved more slowly and did not run unless they needed to escape a predator. which scientific fact is best supported by her observations?