<span>Answer - C
Diesel exhaust fluid (DEF; an </span>aqueous urea solution) is injected into the exhaust manifold (<span>upstream of a </span>catalyst) at a precise dosing rate. In the exhaust pipeline, the aqueous urea vaporizes and decomposes to form ammonia (which <span>is the desired product</span><span>) and </span>carbon<span> dioxide.</span>
C. math // the other 3 classes are electives.
I and III only. I assume this is APES. Recycling old products reduces the usage of materials by using old ones and planting a new tree to replace every tree cut down would allow the world to continue economic developments while not exhausting forestry. II is wrong because if every adult had 3 children then a family would have 6 children and more children = more resources
