Answer:
The one major change that occurred was the placement and organization of the electron.
Answer: Biochemical engineers conduct studies on cells, proteins, viruses, or other biological substances to determine optimal conditions for growth or inhibitors that can stop or kill. They develop and conduct experiments to observe interactions of raw materials with each other and in specific environments.
Explanation: Hope this helps :)
It looks like a toothless off of how to train your dragon tbh