[Q]: What is the missing first step of the following process:  -  Eventually it burns all its hydrogen - Becomes a red giant - Once the red giant burns itself out - The core of the star collapses - The gasses will start to disperse - Only the core is left - A white dwarf has been formed.
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[A]: A star burns in space


[Q]: What is the missing first step of the following process:  -  Chemical compounds rise into the air - Chemical compounds mix with elements in clouds - The affected rain falls to the earth - The affected rain can harm natural and man-made objects because of its acidic content.
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[A]: Human industry produces chemical compounds


[Q]: What is the missing first step of the following process:  -  Is trapped - Plant also takes in water and carbon dioxide from the environment - The plant forms glucose - The plant releases oxygen into the atmosphere.
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[A]: Sunlight strikes the chlorophyll molecules in the plant


[Q]: What is the missing first step of the following process:  -  The isotope is unstable - The isotope emits radiation - The isotope decays - The isotope loses some atomic particles - The isotope turns into a different element - The isotope is finished decaying and emitting radiation.
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[A]:
An isotope has too many protons