(Solved) what gave the mammals the opportunity for advancements?

The reason why we have so many things on earth is due to DNA mutation that took place over millions of years. When our DNA replicates it constantly undergoes mutation due to a number of reasons such as the chemicals in our body, exposure to different radiations or simple mistakes made by our body. As a matter of fact some diseases are examples of genetic mutation that occurred in humans and have been passed down from generation to generation through reproduction. A good example of this would be the royal families of Europe who married within their own families for control of power and in turn their genetic mutations are visible within their family. I think the Burbon family is famous for their noses and teeth.
So how does this relate to species? Well, when the dinosaurs were around, giraffes had short necks which limited their ability to feed off tall trees, since there is no grass in africa they could only feed on bushes. Now imagine all of those giraffes plus other animals competing for that limited amount of bushes, only so few can eat. Now at some point, two giraffes "did it" and their baby had a genetic "f&@! up" wich resulted in him having a long neck. This allows him to feed on tall trees now and he is not going to have any problem with food. Then he "does" another giraffe and his DNA gets passed down. So now there will eventually be more and more long necked giraffes who have plenty of food. The short necked one have to compete with them selves and other animals so they eventually die off. Now this happened over a very long period of time so keep that in mind. Other factors such as climate changes and so on also plays a role.
Now at some point, all continents were connected. Then earthquakes started to slowly but steadily break up one continent into what we have now. (Each time there is an earthquake continents move apart by a few centimeters). So as animals were walking around, earthquakes broke up the continent, creating canyons and oceans that those animals couldn't cross anymore. Therefore where ever they were they stayed and reproduced there. So elephants were in Africa so they stayed there.

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what gave the mammals the opportunity for advancements?

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