Which of the following statements about the brain development is true?
a. brain areas liked to thinking, memory, and language develop late in childhood
b. at birth, we have the largest quantity of brain cells we will ever have
c. infant brain size increases slowly the days immediately following birth
d. brain architecture is dictated by experiences more than genes

B

Explanation:

The following statement about the brain development is TRUE

B. at birth, we have the largest quantity of brain cells we will ever have

At birth, a baby’s brain is said to  contain 100 billion neurons, a number of brain cells that can be compared to the number of stars in the Milky Way. These are almost all the neurons the brain will ever have. As the neurons mature, more and more synapses are made and  as a normal part of brain development, the brain will eliminate connections that are seldom or never used. This will result in a  reduction of  the number of neurons.

i'd say that the moon rock is about 2.2 billion years old.