instruction:
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.
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) Living organisms in the sea die (2) The matter forms on the sea floor (3) After many years the matter is compressed and heated (4) The result is that crude oil forms.  
Where does the following step fit into the given list of steps: Layers of sediment form above the matter compressing it 
answer:
 After step 2. 


question:
Steps: (1) In this stage the chromosomes become visible and the centrioles separate and move to opposite poles of the cell (2) In prophase the chromosomes become visible and the centrioles separate and move to opposite poles of the cell (3) In metaphase the chromosomes line up across the center of the cell and become connected to the spindle fiber at their centromere (4) In anaphase the sister chromatids separate into individual chromosomes and are pulled apart (5) During telophase the chromosomes gather at opposite ends of the cell and lose their distinct rod-like shapes (6) Two new nuclear membranes then form around each of the two regions of DNA and the spindle fibers disappear.  
Where does the following step fit into the given list of steps: Prophase is the first and longest stage of mitosis 
answer:

 Before step 1.