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So the theoretical start point of a new species emerging today would be where?
How did man appear on earth? The fierce moon giant, Tiki Tiki Too, shot men and women to earth with his mighty bow, PlanetSlayer, in order to win an archery contest with the gods. That was back in the old days, when men and women often got shot places by the giants. Today's kids have it much easier when they want to travel.
The early earth was a cooling, spinning ball of lava. Nucleotides formed and joined other nucleotides to form replicating polynucleotides (RNA). This single stranded RNA bonded with another strand for form double stranded DNA. DNA attracted lipids which naturally clump together around the DNA, forming a cell. As this cell replicates itself, the replications are imperfect but some mistakes (mutations) are beneficial, some are neutral, and some are harmful. Obviously, the organisms with beneficial mutations survive better and so life gradually became better and better equipped to survive. After billions of years of mutations and natural selection we are left with humans and innumerable other highly complex species.How did man appear on earth?
In a group of animals that is adapting away from the rest of the population.
Like the squirrels of Grand Canyon or the lizards of Pod Mrcaru.
Lizards Undergo Rapid Evolution After Introduction To A New Home
These are examples of what is called Allopatric speciation. Basically it means populations that have been divided by a physical barrier that prevents them from interbreeding, will tend to evolve away from one another. This is a combination of genetic drift and adaptation to new situations.
There are other ways for species to form as well. But this is the easiest one to discribe first.
wa:do
*Sunstone is right, there is not definite start line, just like there is no hard distinction between the people of the Roman Empire and Italians. Its a long blurry process.
You make it sound like scientists just 'decide' everything.Eddy Daze said:So we have two split parts of the same species at some stage science may examine the lizards that are being born in part (a) and decide that they are now a new species, so its mother and father will be a different species than it.
But it is not necessarily recommended. :run:I guarantee you any healthy 'child' of one species, will be able to mate with their parents.
Not entirely. The species concept is under review and the old way of solidly defining what is and isn't a species is not as solid a line as you suggest.So we have two split parts of the same species at some stage science may examine the lizards that are being born in part (a) and decide that they are now a new species, so its mother and father will be a different species than it.
Paint a spectrum. Yellow on the left, gradually changing to red on the right.
At what point does yellow change to orange; orange to red?
It's all arbitrary. There's no clear discontinuity.
So we have two split parts of the same species at some stage science may examine the lizards that are being born in part (a) and decide that they are now a new species, so its mother and father will be a different species than it.
Umm.... No.
If science is saying new species form , then surely they will form at a certain point, eg when the offspring of group (a) are unable to breed with group(b)/or the offspring of group (b)..for instance when examining a spectrum we aould mark a specific point where orange becomes red