Posted by:
kimball
(
)
Date: March 25, 2014 12:34PM
Here's how evolution probably worked. Due to the extreme tidal influence from the moon shortly after it formed, massive tide pools extended hundreds of miles wide around the globe. Within these tide pools certain chemicals began to concentrate as they weren't allowed to leave at the same the rate they were brought in.
Within these pools bubbles began to form. Some bubbles lasted longer than other bubbles, due to their inherently different chemical concentration. In other words, some chemicals allowed certain bubbles to last longer than other bubbles, which over millions of years led to the predominance of those types of bubbles in the tide pools of the Earth. These bubble-friendly chemicals formed the basis for modern lipids, as the process of natural selection caused the lipids to form layers constructed by hydrophilic heads and hydophobic tails.
Different forms of bubbles emerged, though they soon lost their identity of what we would call a bubble, and instead were composed primarily of the organic matter that had given their bubble ancestors advantage. Some of these proto-cells evolved to produce more organic material using carbon dioxide. Some lived off of organics from other organisms, and eventually a form evolved to digest organic material. Some even developed genetic memory, or early forms of DNA, which served as a blueprint for the proteins that increased their chances of survival. These organisms lived in a symbiotic relationship, which continued so long that eventually could no longer be distinguished from one another and would forevermore be recognizable as cells, a synthesis of bacteria, cyanobacteria, and prokaryotes.
Single-cell life continued its course for over half the age of the Earth, becoming increasingly efficient. Billions of years passed. Then, during a period called "Snowball Earth," the entire surface froze in an icy gridlock from pole to pole, covering everything including the equator with solid ice for tens of millions of years. Life clung together in small havens, and where havens weren't available it more often than not died. However, there were a few blips where cells replicated themselves without actually pulling apart. For billions of years these occurrences had never provided any advantage, and instead made it harder for the cells to move around and thrive. However, under Snowball Earth conditions it was extremely helpful, allowed the bunches of connected cells to draw on the warmth of each other to survive the freezing conditions.
When sufficient carbon dioxide had been released by volcanoes to thaw the earth, multi-celled life which had by this time had become so dominant began to flourish. This is when we see the earliest fossils in the Earth's strata. Piecing multiple cells together suddenly offered natural selection a host of new possibilities. Certain communities became plants. Others became animals. One line even turned into a tunnel-boring creature whose habits allowed it to survive a terrible and hot extinction event. This creature was the ancestor of all mammals.
Mammals were completely outdone by the dinosaurs, though, monstrously large creatures at the top of the food chain that crushed everything in their path. Their size would be their own doing, however, when the next major extinction event came. Smaller dinosaurs survived and turned into birds, and mammals were now free to become the next dominants species on the planet. One line of mammals evolved among tall trees and hard-to-reach food, allowing those with long arms and clever minds to have a statistical advantage in survival. These were the primates.
One of these primate groups learned how to use tools, which became such a widespread practice that they stopped using their hands for moving around altogether and learned to efficiently use their feet. With their hands free for creativity, their brains developed an extremely keen sense of creativity as well. They used this creativity for all sorts of things - tools, partnerships, language, religion, and ultimately civilization.
However, as some humans grew more logical and rational, others continued to stubbornly refuse.