A boyfriend is someone who you find more than a friend. Someone who you have a deeper connection with. An age to have one really depends on the person and is mostly decided by parents. If the person is mature they may have one around 15 to 16+ years old. If the person is still "immature" or is not ready to have one, the age limit may be extended to 17+
I think the answer is periodic motion.
I believe the answer is D. <span>The hypothesis is revised and another experiment is conducted.</span>
+2 electron charges = 2x1.6x10^-19Coulombs