Homework Help: chem help ASAP!!!!

Posted by optifree on Sunday, April 22, 2007 at 7:52am.

What ions are very important for the proper fuctioning of biological systems such as nerves and cells?
A)alkali earth metals
B)hydrogen ions
C)oxygen ions
D)nitride ions
E)alkali metal ions

my choice is A or C
can anyone help?

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