Plants make their own energy so they are NOT heterotrophs. The answer is C.
The correct answer is Chemical. Because two substances are reacting and creating a new substance.
Chemical methods--It includes ion exchange, precipitation, oxidation and reduction, and neutralization.........
Thermal methods--In this, high-temperature incineration, which not only can detoxify certain organic wastes but also can destroy them....
Biological treatment-- It is of certain organic wastes, such as those from the petroleum industry by a special method called landfarming
Physical treatment-- It concentrates, solidifies, or reduces the volume of the waste. Physical processes include evaporation, sedimentation, flotation, and filtration....
I think it is C, but I could be wrong because I am taking an educated guess.
A white dwarf is the answer
