[WhiskeyX]

“1. 4.6 billion years ago (bya): Earth first formed.”

Before the “Earth first formed” and the Sun first formed, other stars and planets were formed and subsequently obliterated into nebular clouds of gas, dust, ice, metals, rocks, and asteroids. These materials were subsequently incorporated into the accretion of the Earth and the Moon/Luna. Life had the opportunity of many billions of years to form in the nebulae of interstellar space and/or on prior planetary bodies before the Earth ever came into existence. Until we can compare samples of the earliest forms of Life found on the Earth to samples of even earlier forms of Life found in extraterrestrial locations, there will be no certain means of fixing the place and time of the origin of Life on the Earth.

[BroJoeK]

WhiskeyX: "...Until we can compare samples of the earliest forms of Life found on the Earth to samples of even earlier forms of Life found in extraterrestrial locations, there will be no certain means of fixing the place and time of the origin of Life on the Earth."

I doubt if we will ever know how much of life's chemistry originated on Earth, and how much, if any, was "seeded" from somewhere else.
Today we only know evidence suggesting 400 million years from Earth's formation to first possible life.
That's a long time -- for example: 400 million years ago was still Early Devonian epoch, a good time for sharks, but no land animals or birds yet.
A lot can happen in 400 million years.

So, were extraterrestrial "seeds" planted here?
Maybe, but maybe not.
I'd go with "maybe not" until somebody proves otherwise.

Deep sea vents: