- Sediment builds up over the remains - The remains decompose, leaving only trace amounts - The remaining parts over the years are replaced with mineral - A fossil is formed - What might be the first step of the process?
Ans: Animals and plants die in soft soil or mud

- The water combines with carbon dioxide in the air to form carbonic acid - As the acid is formed, the iron starts to dissolve - Some of the water breaks down into hydrogen and oxygen - The free oxygen and dissolved iron bond together - They form iron oxide, which is rust - What might be the first step of the process?
Ans: Water comes into contact with something made of iron

- The pancreas creates juices that help digest food - The pancreas releases the juices into the stomach - Trypsin and chymotrypsin digest protein - Insulin is produced to move glucose from the blood - The enzymes begin producing again. What might be the first step of the process?
Ans: The pancreas detects chemical changes in the stomach

- The heated water evaporates - The salt is left behind - The evaporated water condenses on a cold surface - The evaporated water is collected - The process is repeated - More salt is removed from the water. What might be the first step of the process?
Ans: Water is heated