OUR PLANETS OXYGEN
When billions of single-cell organisms began to release oxygen as the sun starts to heat up. The otherwise almost oxygen-free earth gradually develops and an oxygen-rich atmosphere.
Our Goal
Sexual reproduction gives you a large variety of different genetic variants.
The single-cell organism lived on this planet for almost 3 billion years and then came the Dinosaur which occupied the planet for almost 70 million years.
The first recorded human fossils that were found were Lucy. Lucy and her kind were quite short, shorter then modern-day pigmies, even under 4 foot 8 inches tall for the men, from our humble beginning humans grew to an average till they were about 6 feet tall around 50 000 years ago.
In other words, sex guarantees variation and those variations and attributes that best fit the environment evolved and exploited in a process called natural selection.
50 000 years ago.
Lucy and her kind were quite short, shorter then modern-day pigmies, even under 4 foot 8 inches tall for the men, from our humble beginning humans grew to an average till they were about 6 feet tall
3.6 Billion years
START OF AGRICULTURE
Things change and we see a decline in stature down to 5 foot 3 inches for the adult males. What could cause this reversal in fortune, a changing environment? It kills the prey they eat and forced them to find new sources of food. People were not eating as well. People who previously hunted and gather food just could not find enough and they started to harvest food that was probably growing in their garbage piles. The seeds sprouted out, and they said hey we could eat some of our garbage.
Good nutrition would be scarce and height would remain compressed until the late nineteen century when better food improved sanitary conditions and health care took the brakes of human height.