Q: What is the missing first step of the following process:  -  The virus enters the human or animal body - The virus goes to the part of the body that contains its food - The virus consumes part of the body or materials that the body uses - The virus replicates and spreads - The virus causes symptoms in the body as the immune system tries to expel the virus.
A: Contact is made with a virus

Q: What is the missing first step of the following process:  -  Water is in the air - The water forms tiny ice crystals - The ice crystals collide with each other - The ice crystals stick to each other - The ice crystals get bigger as more of them stick together - The ice crystals get too heavy to be in the air - The ice crystals become snowflakes - The snow flakes fall to the ground as snow.
A: The air is cold

Q: What is the missing first step of the following process:  -  Diaphragm and other muscles expand to allow room for your lungs to fill - The air flows into the narrow bronchioles in the lungs - From the bronchioles to the alveoli - The oxygen enters into the bloodstream - Is switched with the carbon dioxide in the bloodstream - The carbon dioxide enters through the alveoli - Through the narrow bronchioles - Into the lungs - The carbon dioxide is exhaled out of the body.
A: You breathe in

Q: What is the missing first step of the following process:  -  The water rises up in the air - It starts to cools down - The water starts to condense - It forms into clouds - When there is enough moisture in the clouds it starts to rain.
A: