The earliest form of exchange was known as barter
Earliest Available Time or Earliest Arrival Time
I think the earliest form is poem, because The Book of Songs is the earliest poetry anthology and the earliest literature.
what are some of the earliest forms of customers service
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Baybayin
Cyanobacteria.
earliest
The earliest form of a word is called the "root" or "proto-word." It represents the basic, original form of a word before any modifications or derivations occur.
mahesvara
Cave drawings.
earlier, earliest
earlier, earliest