One alternate acid base theory states that an base is
A. an OH–1 acceptor
B. an H+1 acceptor
C. an H+1 donor
D. an H3O +1 donor

i think it is d. e because the next one is igneous.

the answer would be b i believe

because natural gas is colorless, odorless, and tasteless, distributors add mercaptan (a chemical that smells like sulfur) to give natural gas a distinct unpleasant odor (it smells like rotten eggs). they locate the types of rock that are likely to contain natural gas deposits.