[Q]: What is the missing first step of the following process: - The oxygen travels into the lungs - The oxygen binds to hemoglobin proteins within erythrocytes (red blood cells) - The erythrocytes are pumped through the body by the heart - All cells receive the oxygen.
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[A]: Oxygen enters the body through the mouth or nose

[Q]: What is the missing first step of the following process: - Placed into the dishwasher - A detergent is added to the detergent dispenser - The dishwasher is closed - The power is turned on - In about 1.5-2 hours, the dishes are clean -
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[A]: Dirty dishes are rinsed

[Q]: What is the missing first step of the following process: - May come from different sources - The gases remain trapped in the atmosphere - Through the suns light the gases hold in heat and energy - Trap them in our atmosphere - The earth may become warmer this way.
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[A]: Several types of gases form in the atmosphere

[Q]: What is the missing first step of the following process: - Composition of blood is regulated - Volume of water in blood is kept constant - PH is kept at a constant level - Kidneys help regulate blood pressure - Kidneys stimulate the making of red blood cells - Calcium levels are maintained.
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[A]:
Kidneys filter waste out of blood