| bluxx said: what evidence for evolution? Where are all the millions of transitionary fossiles? If we did indeed evolve from the primoridal slime what happened? Did the fish thing land on the land and realise it couldn't breath and somehow got washed back into the ocean? Then kept doing this over millions of years and then somehow developed lungs to breath air. Then, once it developed lungs did it then develop legs, organs to reproduce etc? Ask a mathematician the earth is not old enough for evolution to be correct. sorry that's a fact. Mathematicians have debated biologists and left them questioning... there simply isn't enough time from the creation/big bang date to today. Even at billions of years the earth is too young to have had life evolve. Want to look at the complexity of just a single cell happening by random chance which is what evolution needs - that would be like covering North America with dimes that reach to the moon - then placing one red dime among the trillioins of dimes covering the continent reaching up to the moon then asking a blind man to just pick one and him picking that red dime. thats the probabilty mathematicians have calculated for the simplest of elements for life... sorry evolution doesn't add up. |
Here is a website that shows some of the many transitional fossils that scientists have found http://www.transitionalfossils.com/. Evolution does not explain the origin of life, it only explains the diversity of life. The origin of life is abiogenesis. Scientists have developed early earth conditions that produced not only simple organic compounds, but many amino acids, nucleotides, and sugar compounds necessary for life.
There is no universal agreement on why fishes adapted to land(we know they did based on the fossil record), but here are just some few hypothesis: The fishes that evolved were in freshwater rivers/lakes/swamps, and those areas would dry up and be refilled constantly throughout the year(this is seen through lungfishes which are fishes that have lungs and can survive months without water), so having lungs would be useful to breath air until the rains came in. The arms would be useful in crawling to other rivers/lakes when the water dries(we see that through adaptation through mudskippers). Another reason why leaving the water might be useful is for escaping predators and as a useful source for food since there was little to no competition outside of lakes. After looking at some of the reasoning, it's not unusual why fishes evolved into tetrapods.
Single celled organisms that exist today are not suppose to be simple. They have been evolving almost 4 billion years in environment of harsh competitions. Bacteria are one of the most adaptable organisms on earth and can survive pH levels from 1-14 and temperatures from the vents of lava in the ocean to the top of the Himalayas.
Now the probability of a simple self replicating chemical reaction is fairly slim. After that, the suitest molecule would be the one that replicates the quickest. Eventually those molecules would absorb from other replicating molecules in order to replicate quicker. This was the first competition against other reactions. Some absorbed other molecules and replicated while others found protection through lipid layers(which in water encloses like a bubble) which protected the molecules. This was the first cell. It was very basic. This cell would continue to replicate by absorbing molecules that could penetrate the lipid layer. After millions of years different cells used different methods to absorb molecules. Some using sunlight as a catalyst for reactions. Eventually one cell might absorb another cell in which both can bennefit each other(endosymbiotic theory). This would be the first organelle(this explains why mitochondira which is an organelle has two layers since the absorbtion would create a second layer). Eventually, single celled organisms would exchange genes in order to adapt quicker. This was the first "sex"(transduction, transection, transformation,etc). Through time, cells would produce colonies of cells in order to team up against other single celled organisms. This was the first multicellar organism. Eventually these multicellur organisms anchored to the ground and became a polyp(similar to sponges) which filtering food(single celled organisms) from the water. The lava form of polyps could swim in the water and some organisms remained the lava form their whole life, allowing them to move through the water(through the current at that time since they were not very well adapted to swimming). Eventually some formed hard a structural back(through notochords or vertebrates). This allowed structuring. These swimming organisms adapted to become fishes. The fishes multiplied and evolved. Some remaining in the ocean while some began to colonize in freshwater. These freshwater areas became very competitive and it was useful to get food and stay away from predators. Some adapted lungs and limbs in order to get out of the water where there was little competition and abundant amount of food. These was the first tetrapods/amphibians. Some amphibians began to move away from the waters for there was abundant food further away from water. These organisms began to lay eggs which official cut their dependency to be near water. These were the first reptiles. Reptiles are cold blooded and cannot sustain cold temperatures, which was a problem after a meteor crashed and caused colder temperatures since debree covered the sun, which killed many reptiles. Some evolved fur and internal body temperature to sustain cold winters. These were the first mammals. The mammals evolved into a variety of animals. One took to the trees and swung from tree to tree getting food. These were the first primates. Some eventually left the jungle and went to grasslands which were hot and filled with tall grass. In order to survive, selection preferred primates that could stand on their two legs(bipedal). These primates worked together in groups and began making tools. They're brains began to grow very quickly. These were the first humans. Eventually some figured out how to grow food(agriculture), which allowed them to stay near each other since they needed water to grow these plants. This was the first civilization.
After looking each tiny step, the mile as a whole seems very possible.
