I don't get this can any one take a picture of the answers?

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.

What are two different ways you could find the value of a? explain these methods.

Which of the following forces require physical contact? tension air resistance friction magnetic force applied force