- Nephrons in the kidney filter the blood - The waste that is filtered out mixes with water - Become urine - Ureters carry urine out of the kidneys. What might be the first step of the process?
Ans: Blood carried into kidney by the renal artery

- Put the ice cube tray in the freezer - Wait 5 to 6 hours - Take the ice cube tray out of the freezer - Bend the tray slightly to get the ice cubes out and into a drink. What might be the first step of the process?
Ans: Put water in an ice cube tray

- The stomach churns the food - With the aid of stomach acids - The food becomes a thick liquid - Is then passed to the small intestine. What might be the first step of the process?
Ans: Food leaves the esophagus and enters the stomach

- 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