A. Does the magnet have to be touching the nail to lift the tack or paper clip? b. How close does it have to be? Experiment with different-sized magnets.
c. Does the size of the magnetic field change with the size of the magnet?

ANSWER ALL A, B, AND C.
Thank you.

Which of the following are not typically included in the periodic table? a. atomic mass b. element symbol c. isotopes d. number of electrons

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.

Matter is needed to transfer thermal energy bya. conductionb. convectionc. radiation d. both a & b.