Here is your answer
D. Losing electrons
REASON:
Cations means positive ions.
Positive ions are formed by losing electrons which increase positive charge on the body.
HOPE IT IS USEFUL
Well considering birds follow humane rules, their selection and environment around them being thriving could effect their songs in a positive way. While a bird with a low selection of environmental stuff around them would effect their songs in a bad way giving off a more down manner.
Yes, they r very small indeed
free points haha