Please capitalize where necessary: not least because the widespread use of diuretics contribute to the lack of magnesium by excreting magnesium via the kidneys.
A: Not least because the widespread use of diuretics contribute to the lack of magnesium by excreting magnesium via the kidneys.

Please capitalize where necessary: rebecca (third from left) with her sisters
A: Rebecca (third from left) with her sisters

Please capitalize where necessary: but you can see with all their differences, some basic principles that are crucial to the proper functions of an airport, namely, launching, landing and loading of aircraft and supplies allow, can be accomplished safely and smoothly.
A: But you can see with all their differences, some basic principles that are crucial to the proper functions of an airport, namely, launching, landing and loading of aircraft and supplies allow, can be accomplished safely and smoothly.

Please capitalize where necessary: we had a long session with the extended blue grass band led by julie after dinner. wow!
A:
We had a long session with the extended Blue Grass Band led by Julie after dinner. Wow!