Mammals were among the first animals to take to the skies and we share this pride with birds. At one point in history, our rodents and primates were able to move around and explore new environments using their sense of sight. Of all these species, primates were the only one that could then harness their skill of communication through vocalizations. It was when communication became an art form that it evolved to what we see today; apes used hand gestures instead of mere body language. Human beings found themselves at the top of the food chain, and began to mix their DNA with different species. This created a new species, Homo sapiens. They then formed tribes that began cohabiting together to sustain themselves. Males needed females to reproduce, but they also needed females to help them create the tribe which led to what is known as sexual selection where males competed for female attention through display techniques. This phenomenon gave rise again to early hominid bipedalism, freeing them from locomotion on all fours or using knuckle-walking. This gave them a huge advantage in hunting, eventually leading to the rise of "Homo sapiens" and the extinction of most humanoid species. In all species, offspring carry a percentage of their parents' DNA. In humans, this is about 0.2 percent resembling a larger version of its parent's genes. This is known as genetic inheritance and comes from the evolutionary process that causes their system to work that way through natural selection. Genetic inheritance can be seen in how identical twins carry genes that are identical due to their mother's egg splitting in two after it is fertilized by its father's sperm cell. From this process, we can see that there are many instances that demonstrate the concept of evolution and how closely it is tied to genetics. For example, we know that chimpanzees and bonobos share 99.8 percent of their DNA. What makes such a high resemblance between them is the fact that they belong to the same species, "Pan troglodytes". This means that their genetic similarities come from inheritance from a common ancestor. Chimpanzees and humans differ mainly in their bipedalism and wider brain than bonobos, because human evolution has changed extensively since chimpanzees evolved about 5 million years ago. Scientists say that this is because humans, having adapted to the savannah environment, have created tools to survive more readily while bonobos remained in the tropical forest. Chimpanzees and bonobos are both further classified into distinct genera, while humans are considered to be in genus "Homo" on their own. Another example is the comparison of genomes between species of monkeys and people. The macaque monkey was compared to its close relative the human, showing that they share about 93 percent of their DNA. This means that they can be classified as members of the same species, "Macaca sylvanus" and "Macaca mulatta", respectively.
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