What is the period of cell life when it is conducting

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?

What's the waste product of electrons and pyruvate combining in fermentation?  

What is the meaning of exocytosis ?