Problem: Given the question: What is the missing first step of the following process: - The trees die off - The dead material provides nutrients for more trees - The rising trees provide shelter - And more organisms begin to thrive - The ecosystem known as a forest is made.
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The answer is:
Networks of trees start forming

Problem: Given the question: What is the missing first step of the following process: - Green house gases enter from the earth - Heat is trapped in atmosphere - Different things on earth are hotter - The overall planet is hotter.
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The answer is:
Suns heat enters atmosphere

Problem: Given the question: 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.
++++++++++++++++++++++++++++++++
The answer is:
Contact is made with a virus