SEX represented a Hugh improvement.

I believe that there is no explanation for life. Life exists in its form; the difficulty of asking about the origin of life is that you're asking what is essentially a historical question of a time that is almost unrecorded. Science alone cannot explain the mysteries of life.

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 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.

50 000 years ago.

The first recorded human fossils that were found were Lucy. Lucy and her kind were quite short, shorter than modern-day pigmies, even under 4 feet 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 are evolved and exploited in a process called natural selection.

START OF AGRICULTURE

Things change, and we see a decline in stature down to 5 feet 3 inches for the adult males. What could cause this reversal in fortune, a changing environment? It kills the prey they eat and forces them to find new sources of food. People were not eating as well. People who previously hunted and gathered 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 nineteenth century, when better food improved sanitary conditions and health care took the brakes off human height.

After tens (maybe even hundreds) of thousands of years, the original unrestrained "free love" model of hunter-gather society began to change with the advent of agriculture, the idea of land ownership, and individual wealth. And greed.