It would be carbon dioxide because carbon dioxide makes up the vast majority of greenhouse gas .
Answer:
Left and right: two forces
Total: four forces
Explanation:
If it's just the forces that they are using it would be two the force of each person's hand on the other. However there is also gravity pulling down on their hand but they use another force to pull it up which you can call the normal force.
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The correct answer is C) There are more particle collision
With more particle collision, more reactions are created.