Can u guys help me with my high school biolgy PLZ

What type of genetic drift would be simulated if all the beans that were not selected died out?

Where do the respiratory and circulatory systems meet? a. in the heart b. in the muscles c. in the lungs d. in the brain

If assuming tasting ptc as a simple gene trait, what other genotype would you select to put in this missing genotype box that could result in this phenotype