Evolutionary epic
The core is the story of evolution: natural selection. Around 1830, Charles Darwin take the beagle number of ship travel around the world to study in the world on a wide variety of wildlife. Returned to England in the way, he found himself beak to collect a wide variety of finches in the Galapagos Islands, they have skillfully adapted to their different environments and food sources in. After Darwin and population tend to view this overgrowth leading to scarcity of resources phenomena combine, meaning that if there is competition for resources in the environment, with advantageous features of the species will survive, and to these genetic characteristics to their offspring. Those who did not survive to breed the species, characteristics will be erased in the tree of evolution. Darwin spent 20 years of systematic search for evidence to support his theory, and finally in 1859, he published "Origin of Species", shocked the world. The core point is: natural selection. More appropriate to say is: "non-random selection" or "non-random eliminated." Despite all the mutations are generated by a random replication errors or not the animals are controlled by random mutation, natural selection, but these features, it is not random, so your survival and success mutation breeding down, by your living environment determined by very specific factors.
Evolution is the most thorough test people, to use the most, and was one of the widely accepted scientific theory. It has countless tons of fossil evidence, these fossils show us the common characteristics of species have already gone to help us sort out who originated in what is now the biological ancestors. DNA sequencing technology to further genetic clues tell us the Department of species, you can also DNA measuring the ratio between the two animals to study their close and distant relations, and when they diverged from a common ancestor come; radioactive dating method allows us able to determine the age of various fossils, help us to further clarify the relationship between various genetic lines. Extinct animal fossils will always appear in the corresponding strata, so billion years ago in the Cambrian rocks will not appear fossil rabbit skeleton. Closely related species, also typically distributed geographically close to each other, not to mention the evolution took place in front of us, whether it is a new species appear in the new discovery of new environment, or animal populations around the world, almost stable and unchanging the mutation rate ...
Back prokaryotes and eukaryotes, gradually, some unicellular eukaryotes started working together, "symbiosis" way through something called a cell to do something in exchange for another cell to do some other things, collaborate with each other , co-existence. Around 650 million years ago, Earth was completely frozen, many bacteria underwater submarine under the ice and survived, photosynthetic organisms could survive in small hot spots where there is liquid water. In such harsh conditions, a single cell survival through cooperation, this is the place to open up the evolution of complex multicellular organisms epic. From the birth of the first complex multicellular life, until today, the Earth experienced a total of five mass extinctions. In nature, species are competitive niche. Niche refers to an area of the environment, biological characteristics and requires specific skills to get food and reproduction. When a niche to fill, very competitive, and the environment is very characteristic species match the pace of evolution is usually slow number. But when a catastrophic extinction event wiped out most of the animals in the niche, survived have space, the lack of competitor species will quickly evolve new features to fill the niche again, this process is called "adaptive radiation." Evolutionary epic, is the niche is filled, then emptied the disaster, has been re-filled rapid evolution of new species in the process.
_ _ To be continued