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It was Darwin who first spoke of the theory of evolution. To survive, living beings adapt to the environment by acquiring or getting rid of resources that will allow them to reproduce more and better.
Natural selection is the basic principle that the naturist explains in his acclaimed work The Origin of Species .
The human body is the result of millions of years of evolution but even so, it is not perfect. There are some parts of our body that we no longer use at all but that are still there. At least for the moment.
Here we tell you 5:
1. Muscles for the ears
Are you able to move your ears without touching them?
There are people who are able to do so because they still have a gene that determines the existence of three muscles around the ears: the anterior, the posterior and the superior.
Today this is useless but thousands of years ago it was useful to be able to direct the ears and sharpen the ear. It is said that humans lost this ability because without predators in sight and without the need to hunt, we did not need it.
However, this is still done by many animals. Cats, for example, are able to move their ears independently to pick up noises coming from different directions.
2. The coccyx
The coccyx is at the end of our spinal cord and is the remains of the tail that our ancestors had and that helped them maintain balance.
Now that we are upright we no longer need this support but this bone is maintained to help us be comfortable when we sit down and acts as an important anchoringpoint between our muscles.
3. The appendix
In the shape of a sock, the appendix is a small portion of the digestive systemthat is located in the lower right part of the belly, between the small and large intestines.
It does not fulfill a clear function in digestion. It may have been useful at some time to help us digest the leaves or it may have helped us recover from an infection in the past but scientists still do not know what their specific function was.
The appendix can become inflamed, leading to a painful condition: appendicitis,which is quite common and causes many people to have it removed.
4. Wisdom teeth
We have teeth with different shapes because they perform different functions. The incisors on the front of the mouth help to cut the bite-size pieces, the pointed canines are for tearing the toughest foods such as meat, and the molars serve to make the food reach a texture that we can to digest.
But there is a type of tooth that we could do without: the s wheel s judgment . They are in the back of the jaw and develop as we get older. They usually appear when we reach adulthood .
Our ancestors used them to chew plants but today we do not need them at all.
The problem they generate is space. We do not have enough space for them in our jaws, which means that they generally push the other teeth as they make their way to the surface and this can be very painful.
The fault of not having enough space is the brain, which has grown larger over time, modifying the shape of our head.
When we feel cold our skin bristles , the muscles become tense and a kind of protuberance is created on the skin.
Our ancestors were covered with thicker hair. This helped them keep them isolated and warm in the cold.
Even though our hair is now much finer, the air is still trapped between the fine hairs of the skin with low temperatures and helps us to keep warm .
Goosebumps also served to make our ancestors look bigger. They used it as a means of defense in a threatening situation, making them seem more fearsome. Many mammals, such as dogs and cats, continue to occur.
When we are afraid we continue to react like that. Look at the next time something scares you.