Given a list of steps and an additional step, determine where the step fits into the original list of steps. A correct answer, correctly places the given step into the set of steps so that it creates a new plausible set of steps. Output must be formatted as 'After step n', where n is the step number after which the given additional step is to be inserted.
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Question: Steps: (1) Dead organic material accumulates on the bottom of oceans, riverbeds or swamps, mixing with mud and sand (2) Over time, more sediment piles on top (3) The resulting heat and pressure transforms the organic layer into a dark and waxy substance known as kerogen (4) The molecules break up into shorter and lighter molecules composed almost solely of carbon and hydrogen atoms (5) It will turn into either petroleum or natural gas  
Where does the following step fit into the given list of steps: Left alone, the kerogen molecules eventually crack 

Answer:  After step 3. 


Question: Steps: (1) Water is transported to the leaves in the xylem (2) Energy harvested through light reaction is stored by forming ATP (3) Carbon dioxide and energy from ATP are used to create sugar (4) Oxygen exits the leaves through the stomata by diffusion (5) The plant reuses the water or the water exits through the stomata as water vapor.  
Where does the following step fit into the given list of steps: Carbon dioxide enters the leaves through the stomates by diffusion 

Answer:  Before step 1. 


Question: Steps: (1) Solar radiation reaches Earth's atmosphere (2) Some is reflected back into space (3) The rest of the energy is absorbed by land and oceans, heating the Earth (4) Heat radiates from Earth to space (5) Some of this heat is trapped by greenhouse gases in the atmosphere (6) This causes more heat radiation to stay trapped in our atmosphere (7) The Earth's temperature rises  
Where does the following step fit into the given list of steps: Human activities such as burning fuel are increasing the amount of greenhouses gases 

Answer:
 After step 5.