2. Rob is in charge of waxing the floor at the local mall. He wants to test a new brand of floor wax called Squeaky Clean. Rob waxes 20 floor tiles with Squeaky Clean and
20 tiles with the original wax brand. After one week he counts the number of
scratches on the floor.
a. Independent Variable:
b. Dependent Variable:
C. Control Group:
d. Constant:

during the process of dna replication, brdu can replace thymidine and incorporate into the newly synthesized dna, cell proliferation thus can be reflected in the extent of brdu incorporation.

answer: substrate concentration. enzymes work best when there is a high enough substrate concentration for the reaction they catalyse.

brain development. a child's brain undergoes an amazing period of development from birth to three—producing more than a million neural connections each second. the development of the brain is influenced by many factors, including a child's relationships, experiences and environment.

explanation: