The break down of carbon based molecules into smaller molecules
Answer: C.
because I translated it to what the answer is
Th earth scientists have improved our understanding with the environment because of their studies in which they had shown better understanding and explanation of occurrences with the means of having to provide not only explanation nor visuals but also providing proof of these mere existence that made people believe and understand the environment.
Answer:
option 3 in 1st one and option 4 in 2nd one I think
Carbon ,hydrogen ,and oxygen