010 10.0 points What has the greatest amount of potential
energy?
1. a 0.5 kg book at the top of a 100 m hill
a
2. a 2 kg boulder at the top of a 10 m hill
3. a 5 kg rock raised 5 m off the floor
4. a 2 g penny in an airplane at 1000 m
above the earth

What changes occur in the brain during the teenage years? 25 points, someone me out!a.) thinking becomes slower as the brain grows larger. b.) connections between neurons become stronger and faster. c.) unused neurons fuse together to form larger, better functioning neurons. d.) more neurons are developed.