Choose all of the secondary sources used by humans for energy !! Wind
Solar
Water
Plants

Wind or solar...٩(●˙—˙●)۶٩(●˙—˙●)۶٩(●˙—˙●)۶

Explanation:

(●￣(工)￣●)⊂(￣(ｴ)￣)⊃¯\_(ツ)_/¯

if two electrons have the same n, the same ℓ, and the same ml, then they are in the same orbital. the pauli exclusion principle states that no two identical fermions (a fancy word for electrons and other subatomic particles like electrons) may occupy the same quantum state in an atom simultaneously.

they it depends on if one believes about radioactivity, they make a geiger counter beep but maybe it was going to beep anyway electronics do wierd things all the time or it was programmed to beep near certain metals.