20. What is split to replenish the electrons (that also makes Oxygen gas)? 21.The excited electrons pump what ion to create a gradient? 22.The ATP synthase uses this gradient to restore ADP back to ATP. What is this process called? answer is ; A

if you know your abc's you should be able to get your answer or just use google

those characteristics are cellular organization, reproduction, metabolism, homeostasis, heredity, response to stimuli, growth and development, and adaptation through evolution. some things, such as a virus, demonstrate only a few of these characteristics and are, therefore, not alive