Answer:
I'm tall in the morning and short in the noon. I disappear at night but I will be back soon.
What flies without wings? What passes all things? What mends all sorrow? What brings the morrow?
This thing runs but cannot walk, sometimes sings but never talks. Lacks arms, has hands; lacks a head but has a face.
What is seen in the middle of March and April that can’t be seen at the beginning or end of either month?
What has four legs during the day; and six or eight during the night?
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.