If there was a larger population of rabbits than dandelions, and the rabbits only ate the dandelions, they would eventually run out. then the rabbits would start to die too, since their main food source is gone.
The "hotter" the final color of the reagent, the higher the concentration of reducing sugar. In general, blue to blue-green or yellow-green is negative, yellowish to bright yellow is a moderate positive, and bright orange is a very strong positive.
Start with the one that you know better the beginning of essays are hakf the tine awkward anyway.
