How have humans changed the atmosphere of the planet in the past 200 years

Answer

One way is that we have increased the amount of CO2 (carbon dioxide) in the atmosphere.

Primarily by increasing the amount of carbon dioxide in the atmosphere by burning carbonaceous materials for energy.

Explanation:

try using substitution:

x + y - 6 = x - y. (i'm not giving you the exact answer). since 0 = x - y, then sub 0 in the equation with x - y. combine your like terms, and then use inverse operations, and you'll have your answer.

: -)

answer: substrate concentration. enzymes work best when there is a high enough substrate concentration for the reaction they catalyse.