What must a cell do first to divide successfully?

Witch type of microscope is used to view very small cell components like proteins and dna?

(amoeba sisters video recap: pedigrees and need

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?