Bacteria and Cells with fomed from the big bang, but if you are a creationist then, Adam and eve
Cyanobacteria.
The earliest form of exchange was known as barter
unicellular organisms are earliest forms of life
Stromatolites are one of the earliest known life forms; some fossils may date back 3.5 billion years - before Earth had any oxygen in it's atmosphere.
The earliest forms of life likely used anaerobic respiration, which does not require oxygen to produce energy. This process is less efficient than aerobic respiration but can still generate ATP for cellular processes.
Earliest Available Time or Earliest Arrival Time
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All land animals evolved from under the water. I would say fish and ammonites.
The earliest evidence of life on Earth comes from fossilized microorganisms that are approximately 3.5 billion years old. These microorganisms are simple bacteria-like organisms known as prokaryotes. They thrived in environments such as hydrothermal vents and shallow seas.
what are some of the earliest forms of customers service
I think the earliest form is poem, because The Book of Songs is the earliest poetry anthology and the earliest literature.
The earliest ones still around are stromatolites, but there were lots of earlier life forms.