Answer:
What goes up let's of a load and come back down
A twiggy home
What is at the end of a rainbow?
What can be white and yellow at the same time?
What is in seasons, seconds, centuries, and minutes, but not in decades, years, or days?
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.