When NAD+ becomes NADH, it is being

NAD+ accepts a hydrogen ion (H+) and two electrons (2e−), as it becomes reduced to NADH + H+. The NADH moves to the electron transport chain and donates a pair of electrons (becomes oxidized) to the first compound in the chain.

Explanation:

d) center of the mid-ocean ridge

give brainleysest

sinserly,

steckh986