The answer is B i answered this already
This was a major breakthrough in geology because it meant that sedimentary strata in diverse parts of a country or area could be correlated as belonging to the same formation which means they were formed at the same time historically so helped to put them in the correct sequence. If these strata contained valuable minerals like coal then it could aid in the search for coal. This helped William 'Strata' Smith in England to create his first geological map in the world of a whole country.
It is a complex of several proteins, pigments and other co factors that execute the primary energy conversion reactions for photosynthesis
Honestly, you'd measure all of them but when people talk about cars, A/C units, or anything like that, it would be nitrogen oxide. green house's don't produce as much of a foot print mainly because they house plants which provide oxygen but they are filled with carbon monoxide so if you have any other information that would help but if not, I'd go with A
