A hypothesis is a testable explanation of a scientific problem that is based on research and observation.
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Dark reaction means that light is not necessary for this part of photosynthesis. In the dark reaction, CO2 from the atmosphere is fixed or becomes part of a carbohydrate dioxide into the form of carbohydrates-organic molecules used as food for the plant. This process is called the Calvin Cycle.
If the statue is like Lady Liberty, and overgoes a change in color and state. For example, she was originally copper, but later changed into patina due to weather such as acid rain, it is mechanical weathering. Please let me know if this helped.
