To be honest, since we live on Earth (assuming you do as well), Earth is the easiest planet to study. We don't know much about the other planets because we've never been to any of them. I believe that the second easiest planet to study is either Uranus or Saturn.
Answer:
Fermentation produces alcohol. Thats how we make rum and beer
Its B. DNA because I did this a long time ago
Artifact selections benefits humans by helping us learn what had happened in the past.
Answer:
6 ,Be electrons ,8,neutrons (mass number)