A sample of disaccharide (sucrose) does not give red ppt. with fehling solution, until it is warmed in dilute HCL. Why?

you can have just about every answer you can think of

the answer is true when observing or determining population size, a direct observation is use, in which each organism is counted in a population or in an area. one benefit of this measure is that you get the exact population count but it will take a long time to  determine  the  size  of a  population.

look at this it will give you up to 17 answers