Laughing gas is made when nitrogen gas and oxygen gas have a chemical reaction. What is laughing gas?

A. A compound
B. An element
C. An alloy
D. A mixture

because of

primary succession occurs in essentially lifeless areas regions in which the soil is incapable of sustaining life as a result of such factors as lava flows, newly formed sand dunes, or rocks left from a retreating glacier. secondary succession occurs

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.