Problem: - Acid rain enters the atmosphere and lands - Makes water acidic - Kills fish - Kills the soils in trees What might be the last step of the process?

A: Leaves are also harmed.

Problem: - Dead organic material accumulates on the bottom of oceans, riverbeds or swamps, mixing with mud and sand - Over time, more sediment piles on top - The resulting heat and pressure transforms the organic layer into a dark and waxy substance known as kerogen - Left alone, the kerogen molecules eventually crack - The molecules break up into shorter and lighter molecules composed almost solely of carbon and hydrogen atoms What might be the last step of the process?

A: It will turn into either petroleum or natural gas

Problem: - Minerals fill spaces between bits of sediment - The sediments become glued together - The glued together parts become hard like cement - The sediment becomes a big rock - The rocks erode slowly - The rocks come apart - The rocks become smaller rocks - The rocks continue to erode into smaller rocks What might be the last step of the process?

A: The process starts again.

Problem: - Food enters the small intestine - The small intestine produces hormones - The hormones cause the pancreas to produce enzymes for digestion - The enzymes travel from the pancreas to the small intestine through tubes - The enzymes help the intestines digest the food - The pancreas produces the hormones insuline and glucagon What might be the last step of the process?

A:
The hormones control the amount of sugar in the blood.