Answer: A) switch from crops to livestock.
Hope this helps, sorry if I got this wrong.
B. An atoms energy level doesn’t have the maximum number of electrons.
Atoms bond in order to film their outer energy shells.
I think glass does. or maybe a glass prism.
These subs are useful in studying the ocean floor, where it is so deep that divers would be crushed by the water pressure. For example, research submersibles are used to study shipwrecks like the RMS Titanic.