Which one of the following processes does NOT use Calcium? Group of answer choices

The answer sould be Component of Thyroxine, Thyroxine contains iodine and are formed from thyronines, which are composed of two molecules of the amino acid tyrosine. Thyroxine contains four iodine atoms, and triiodothyronine contains three iodine atoms.

:  What is the balanced net ionic equation for the reaction in acidic solution of FeCl2 and KMnO4 (Fe2+ becomes Fe3+ and MnO4 becomes Mn2+). (1 point) 

your answer is: 
5Fe2+ + MnO4– + 8H+ 5Fe3+ + Mn2+ + 4H2O 

... 

What happens to the color of the FeCl2 when the equivalence point is reached? (1 point) 

that's a hard one to answer... 
Fe+2 green color converts into Fe+3 which is yellowish at the equivalence point... 

but at the end point, an excess drop of KMnO4 is added, & its pink color mixes with Fe+3 's yellow to give an orangish color 

The color turns purple. is way too much KMnO4 added 
The color turns green., not at the equiv point yet, still alot of Fe+2 
The color turns red. ( i would rather say reddish -orange) 

now if you added phosphoric acid to eleiminate the yellow color of Fe+3, ... 
then your equivalence point should be colorless, and your end point with 1 excess drop of KMnO4 should be pink