2. The dates shown in the diagram above refer to the ages of _?

A original material.
B trace fossils.
C igneous rock layers.
D sedimentary rock layers.

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