What common condition is caused by the presence of three copies of chromosome 21?

Monitor and apply fix up stratorgies

Ronald wants to see if a new shower cleaner works better in removing soap than his old cleaner. he uses the new cleaner on one half of the shower tiles and his old cleaner on the other half. identify the independent and dependent variables in this experiment. enter your answer in the space provided.

Which of these is one of the nitrogenous bases in dna? a. proline b. leucine c. glycine d. thymine