Answer:
What's always coming, but never arrives?
Humans have two that shrink in the light and expand in the dark
A prehistoric reptile that lives today and the inspiration for the name of a popular sports drink.
Consuming food would be pretty tough without these chompers
With sharp edged wit and pointed poise. It can settle disputes without making a noise.
It flows out of the soil, It burns you if it boils, And holds us in its coils, More valuable than gold, As black as it is old.