Your mind must b comparing the chant chicken or egg came first. Answer is great great grandparent generation came first, all 16 of them Second generation forward was 8 great grandparents adding a 3rd generation of 4 grandparents, of 2 parents, delivering the 5th waves of population changes where ancestors were never duplicated twice in this natural algorithm of actions and reactions being equal.
Each generation has siblings and cousins, parents, aunts, uncles that didn't have or children died before the parents became grandparents. That natural ascension with evolving from Great great grandchild into dead 16 great great grandparents 4 more generations after each new ancestor's birth leaving genetics the point of eternal separation of life native to a specific universal location, like how this planet become "What it is."..
After a few thousands of revolutions around the star a species created a means to communicate besides grunts, pushing, and shoving each other around to sort out tyrannic spersons and civil people just adapting in space so far. these methods of communication varied because transportation between continents wasn't established where most traveling would make it back from where they started.
It was 16th century before mankind completed a complete trip around the globe transversing Atlantic, Pacific, Indian oceans.
East is east and west is west for one reason, you dare give it? Two words that explain a rotating planet. Dawn and dusk separate night and day constantly with planet and its moon orbiting the star at the solar system's core 3rd from the sun all the "TIME" ancestors get adapting to space occupying the moment here.
6th sense is proportionately alive along with vision, hearing, feeling(non emotional responses), smell, taste. Why each mobile lifetime has its own choices to pick what direction to go next while adapting in space never same form shaped as arrived a fertilized cell with combined chromosomes of its previous generation gaps creating a new total sum population "left" until great great grandchildren aren't ever added again per lineage or as a species itself, correct?
So is dawn left or right or north and south? Solar system's north star is its sun, not Polaris and Southern Cross. Equator is half way between opposite poles of winter summer solstices with tropics in the middle, Right?
Balancing works 24/7, not exceeds mutually evolving forward as a whole is equal to total sum of all its parts imaging anything else is possible commanding each generation to pretend life isn't self evidently evolving here one ancestor at a time in series parallel space.
Opps, there is a kinetic point of no return equally timing the life in unique points of universal displacement results equally timed apart as ancestrally added in ever changing form each generation gap living.
Why isn't thermodynamics taught with biology instead of theoretical physics? Why isn't rule of 72 in economics part of describing compounding chromosomes to genetics changing population of the entire food chain native in this atmosphere?
Why do races of people originate in specific locations of this atmosphere until mankind created the technology to migrate around the globe. after 1,000's of generation gaps living in "villages" before becoming a global humanity?
Don't play psychological class warfare with my brain navigating space never lived exceeding mutually evolving in plain sight. I am surrounded by 8 billion deniers and their history proves how accurate I am. As does each ancestors DNA, not their language skills diverting away from the natural process of eternally separated in plain sight.