The passage used a combination of comparison and contrast and: <span> C. cause and effect.
</span>The passage give us a well descriptive explanation on how the microorganisms (the cause) developed in such a way to the point where their fossils ended up as a petroleum/coal (effect)
From my understanding all you are doing is converting liters to grams. It says you have one leader of hydrogen peroxide. 1 liter equals 1000 grams. And if it is asking how many grams are in 1 liter hydrogen peroxide then the answer would be 1000 grams
