Answer: Partly it's because teenagers are quite different from their childhood selves. This is because the brain is continuing to mature and also because sex hormones such as testosterone, estradiol and progesterone influence brain function and these are the hormones that rise to adult concentrations at puberty.
Explanation:
The a answer is B because I know that when I was borned I had no hair.
Your answer is A ; weathering and erosion
Explanation:
On the surface weathering and erosion break down igneous rocks into pebbles,sand and mud ,creating sediments which accumulates in basins on the Earth's surface