Problem: Given the question: What is the missing first step of the following process:  -  The spores fall to the ground - The spores germinate - The spores begin to grow mycelium - The mycelium begin to sprout a bud - A new mushroom is formed.
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The answer is:
Spores are dispersed into the air by a mature mushroom


Problem: Given the question: What is the missing first step of the following process:  -  Water droplets are in clouds - The air gets cold - Water droplets turn into ice crystals - Ice crystals in clouds stick together and become snowflakes.
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The answer is:
Water evaporates from the ground up to the sky


Problem: Given the question: What is the missing first step of the following process:  -  The radiation is aborbed by the Earth - Some of the radiation goes back into space - Some is trapped by the atmosphere - If too much heat is trapped - Global warming occurs.
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The answer is:
