Please answer this: What is the missing first step of the following process: - The passenger arrives early at the airport - The luggage is checked - The passenger waits in line - The passenger shows their identification and gets a boarding pass - The passenger goes to their gate - The passenger gets in line when it's time to board - The person boards the plane - The plane arrives at the destination - The passenger gets off the plane at their destination.
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Answer: An airline reservation is made

Please answer this: What is the missing first step of the following process: - Bloodstream - The pancreas - Insulin lower sugar levels - Bloo sugar goes back to normal.
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Answer: Sugar enters the body

Please answer this: What is the missing first step of the following process: - The water comes into contact with the rock below - The rock over the years carves through the rock - The space in the rock becomes larger and forms into a cave - As more rather rushes through the cave becomes a cavern.
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Answer:
Water from the surface seeps below the soil