Match the era on the left with its characteristic on the right. Mesozoic
?
When Earth formed
Precambrian
?
The age of dinosaurs
Cenozoic
?
When most of our
limestone and coal
formed
Paleozoic
?
The era of humans

a. the production of carbon dioxide through the process of photosynthesis

i think that is new experiments yield untrustworthy data and should be carefully considered, because you don't know what will happen with the experiments.