Nerve fibers from the medial aspect of each eye nerve fibers from the medial aspect of each eye cross over to the opposite side at the chiasma divide at the chiasma, with some crossing and some not crossing pass posteriorly without crossing over at the chiasma go to the superior colliculus only

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?