Which human activity will most likely contribute to ozone layer destruction? cutting down trees to build a library
using fertilizer to grow bean crops
planting flowers that come from another area
frequently using an air conditioner in the home

the answer for apex is the lowest

the minimum amperage that the current in this wire would have to have so that its weight is completely supported by the magnetic force due to earth's field, assuming that no other forces except gravity act on it

t = 1/400 h   ⇔ 0.0025 h ⇔ 9s ⇔ 0.15 m

any of the answers are correct.