Answer:
Tiered pricing is a method where sellers segment the pricing of their products or services to suit their various target markets. By optimizing and changing up your offering between each of the segments, you appeal to a wider (and more varied) customer base as you provide for different demand rates and price points.
That is all up to ones opinion no one really knows because no one that is living now was alive then all we can go by is secondary sources to let us know
I'm assuming you mean the molecular compound

and it's name is Hydronium. Hope this helps :)
Answer:
Just letting you know that the meaning of a vestigial structure
Explanation:
It is a structure that has no purpose. For ex. a pig's back toe has no purpose it's just there. It doesn't function