Q: What is the missing first step of the following process:  -  The lungs have a series of smaller and finer tubes and sacs - Air reaches the smallest and finest air sacs called alveoli - Oxygen travels from the alveoli into the blood - Oxygen-rich blood is carried to the heart - Oxygen-rich blood is pumped throughout the body by the heart - Cells take in the oxygen rich blood and release carbon dioxide rich blood - The carbon dioxide rich blood travels to the lungs - Carbon dioxide travels through the throat and is exhaled.
A: Air enters the nose or mouth and travels through the windpipe into the lungs

Q: What is the missing first step of the following process:  -  The water will turn into water vapor - Collect the water vapor - Allow the water vapor to cool - The water vapor will turn into liquid water - The salt will be separated from the water.
A: Boil salt water

Q: What is the missing first step of the following process:  -  The sediments become glued together - The glued together parts become hard like cement - The sediment becomes a big rock - The rocks erode slowly - The rocks come apart - The rocks become smaller rocks - The rocks continue to erode into smaller rocks - The process starts again.
A: Minerals fill spaces between bits of sediment

Q: What is the missing first step of the following process:  -  The rain seeps into the wood surface - It permeates the wood - When rain evaporates it leaves the wood - It takes the finish of the wood with it - The wood begins to lose it's luster - It begins to look bad - It has pieces of paint missing from the rain - It gets worse when it rains - It eventually will have no paint left.
A:
Rain falls on wood