When babies are born, their brains contain about a hundred billion of neurons. However, a few of these brain cells are connected. At age three, there are one thousand trillion connections formed. The brain starts to cut off unused connections at the age of eleven.
<span>D. evidence that are acquired through use or disuse. Since it is believed that some parts of an organism developed through its need. For example a giraffe got its long neck becuase of reaching for a tree that could produce its food. Another example is the leg of a human which developed because of its need to walk. It was believed that the parts of the an organism did exist or did vanish depending if it was no longer used or it was necessarily needed to survive.</span>
Answer:
Explanation:
Wild guess. Photosynthesis