Which statement best explains how two identical copies of a very large molecule can be made during dna replication?
a. dna replication occurs in only one stage of the cell cycle.
b. helicase unwinds small sections of a dna molecule at a time.
c. the formation of the complementary base pairs reduces errors.
d. the same three enzymes always with dna replication.

Which of the following statements about brain development and early childhood is true? the brain of a 5 year old is 60 percent the size of an adult brain the overall size of the brain does not increase dramatically from ages 3-15 by the time a child is 3 years of age, the brain is 25 percent of it's adult size the development that occurs inside the brain ends at the onset of adolescence