Gather information on atoms using the Internet. Then make sure u have the introduction, body paragraphs, and conclusion. My recommendation is to take notes while researching. Take way you just use your notes to write the essay
A concentration gradient of a substance across a membrane represents potential energy because it drives diffusion
The answer would be medulla oblongata
Medulla is the lowest part of the brain stem which has a role autonomous nervous system. Medulla is important to sustain life as it controls the blood pressure(vasomotor), respiratory system and cardiovascular system. It also controls many reflexes that related to cranial nerves like gagging reflex.