TASK DEFINITION: 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.
PROBLEM: Steps: (1) The oxygen passes through the bronchial tubes to the lungs (2) The oxygen is moved into the bloodstream (3) Circulates through the body (4) The cells in the body exchange the oxygen with carbon dioxide (5) The bloodstream carries the carbon dioxide back to the lungs (6) The lungs expel the carbon dioxide through the nose and mouth.  
Where does the following step fit into the given list of steps: A person breathes in oxygen 

SOLUTION:  Before step 1. 

PROBLEM: 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 

SOLUTION:  Before step 1. 

PROBLEM: Steps: (1) Acid rain makes waters acidic (2) Causes them to absorb aluminum from soil (3) Fish and their eggs die (4) Frogs and plants die (5) Insects and other wildlife die (6) The ecosystem is out of balance, causing further problems  
Where does the following step fit into the given list of steps: The water runs off from the soil into lakes, streams, etc 

SOLUTION:
 After step 2.