Q: What is the missing first step of the following process: - Air enters bronchioles - Bronchioles have tiny air sacs called alveoli - Alveoli surrounded by small blood vessels - Oxygen absorbed by small blood vessels - Vessels deliver oxygen to every cell in the body - Blood brings carbon dioxide back to lungs - Carbon dioxide released when you exhale.
A: Air enters the lungs through bronchial tubes

Q: 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

Q: What is the missing first step of the following process: - Bloodstream - Cells in the body are attacked - Cells are killed - Different kinds of sickness are formed.
A: Bacteria enters the body

Q: What is the missing first step of the following process: - Winter comes and the animal finds a place to hibernate - Over a period of days, the animal's heart rate and breathing rate drop slowly - Electrical activity in the brain almost ceases completely, though some areas remain active - The animal has entered hibernation mode -
A:
The animal eats large quantities of food that will be stored as fat