input question: What is the missing first step of the following process: - As the saltwater is heated the water becomes a gas - The salt particles sink to the bottom of the container - Gaseous water is piped into another container - Allowed to cool - The salt particles are left behind in the first container - The second container contains fresh water.???
output answer: The salt water is heated

What is the missing first step of the following process: - The bird collects twigs and other refuse - The bird makes a flat base with twigs - The bird makes sides with twigs and other things - The bird adds softer material to the inside - The nest is done.
----
Answer: The bird picks a tree

Q: What is the missing first step of the following process: - The basidia gives off spores - The spores germinate - The spores create Hyphae - Multiple Hyphae meet and converge - They join with Mycelium - A hyphal knot forms in the ground - A primordia shoots out of the ground - A mushroom cap is formed.
A: A mushroom gives off gills lined with basidia

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

[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.
****
[A]: Kidneys filter waste out of blood

Problem: Given the question: What is the missing first step of the following process: - The water combines with carbon dioxide in the air to form carbonic acid - As the acid is formed, the iron starts to dissolve - Some of the water breaks down into hydrogen and oxygen - The free oxygen and dissolved iron bond together - They form iron oxide, which is rust -
++++++++++++++++++++++++++++++++
The answer is:
Water comes into contact with something made of iron