Itested soda and a sports drink for protein with biuret solution. i got unexpected results. for the reducing sugars test, i got the same results (orange) and i used benedict's solution. benedict's solution and biuret solution both have copper sulfate. i need a hypothesis for why i got the unexpected results.

Which of the following statements is true about the relationship between genetic variation and natural selection? a. genetic variation must be present in a population before natural selection can act on it. b. genetic variation arises in a population as a result of natural selection. c. natural selection can act on a population whether there is genetic variation within the population or not. d. after natural selection acts on a population, the amount of genetic variation in the population always increases.