Put one plant under a white lightbulb, and place the other plant under a red lightbulb.
Measure the growth of the two plants.

Any vitamins or supplements can be obtained without prescription and are widely used as alternative from western medications. most supplements are not valued by the fda or any other drug and food agencies.

Combustion is the act or process of burning. therefore, i believe the answer is  a: burning wood. 

Hello.the answer is  hydrosphere, geosphere, and biosphere  have a nice day