Explain negative feedback mechanism

Efficiency is the percent of work put into a machine by the user (input work) that becomes work done by the machine (output work)

Autotrophs a.consume their food to get energy b.may use photosynthesis to gain energy c.are also called consumers d.cannot use solar energy

What conclusion can be made based on the temperature of soil when the light hits the soil at 0°, 45°, and 90° angles in section 2 of the experiment? did your results support your hypothesis? why or why not?