Explain why people are hesitant to drill for oil in the arctic national wildlife refuge.

Fossil fuels can be described by the decay and compression of organic material millions of years ago. This resulted in extremely fertile soil that helped large rain forests to grow.
One reason why people are hesitant to drill for oil in the Arctic National Wildlife Refuge is because the exact amount and the quality of the crude oil are not known. 

1. and 2. question: in which equation? or i don't understand you, 3. a), 4. c), 5. c), 6. b), 7. d), 8. d) if small number is underlined(behind symbol) , b) if big number is underlined(in front of symbol)9. what is underlined there? 10. c)