Answer:
What word is a plural, but when you add an "S" to the end, it becomes singular?
I am the fountain from which no one can drink. For many I am considered a necessary link. Like gold to all I am sought for, but my continued death brings wealth for all to want more.
What instrument can make any sound and be heart, but not touched or seen?
More precious than gold, but cannot be bought, Can never be sold, only earned if itβs sought, If it is broken it can still be mended, At birth it canβt start nor by death is it ended.
What can be heard and caught but never seen?
People take me on walks and I run and have fun. What am I?