Question

check my work

which is the best version of the underlined portion of the sentence?

Experiments help scientists learn how things happen in our world and why things happen in our world.

(Points: 2)
learn how, but not why, things happen in our world.

learn both how as well as why things happen in our world.

learn not only how but also why the things that happen do in our world.

learn how, and at the same time, why, things happen in our world.

learn how and why things happen in our world. <<

Answer 1

correct