Problem: What is the missing first step of the following process: - The cells of the lung hold the air - They take in the air and remove the Oxygen - They inflate and all the bad air leaves through the mouth - They do it all over again.

A: They expand to take the air in

Problem: What is the missing first step of the following process: - Air goes through all the little branches in your lungs to fill up the air sacs, or alveoli - Oxygen goes through the walls of the alveoli and into the capillaries - The oxygen goes into the bloodstream - Oxygen is left and carbon dioxide is picked up - You breathe it out through your lungs -

A: You breathe in

Problem: What is the missing first step of the following process: - An area of low pressure causes rotation - Several thunderstorms come together around this area - The storm is fed by rising air from warm ocean water evaporating - When the wind speeds reach 74 mph the storm is considered a hurricane.

A: Thunderstorms form over the ocean

Problem: What is the missing first step of the following process: - The cans are transported to a facility - The cans are shredded by a machine - The cans are heated to 1400 degrees to melt them - The molten metal is poured into molds - The molds are flattened and rolled into sheets to reuse.

A:
Put the aluminum can into a recycle bin