We all know what symmetry is from our school years. Teachers of initial geometry explained this concept in detail to us with examples of a circle, square, or less symmetrical triangle and oval. However, in addition to the dry definition, symmetry along with the golden ratio occupies an important place in nature. The existence of its bilateral significance in living organisms was noted a very long time ago. Now we will consider how the existence of symmetry helps us.
What is symmetry? The word itself came to us from the Greek language, and it means proportionality. Dictionaries interpret this meaning in different ways, but the essence is the same. Symmetry - the location of one or more objects is proportional or harmonious to each other. As a rule, in order to determine whether the parts of a single whole are symmetrical, an imaginary mirror plane is built between them. It may be the only one, as well as grow in quantity. Parts of the subject should be
mirror images of each other in these planes. If they perfectly correspond to this statement, then you can visually see what symmetry is.
The doctrine of crystals most accurately determines the element under consideration, since they are all perfectly symmetrical. In addition, symmetry is found in the structure of plants, mirror planes are divided into several identical parts of the branch, flowers, their organs and parts. Animals and people, too, are not without it, but to a lesser extent, and it is called bilateral, that is, bilateral. For example, if you draw a vertical mirror plane (it can only be unique here), then the two parts will be symmetrical. Thus, a fairly widespread symmetry in nature and in practice, and not just in geometry.
The discoveries of paleontologists forced scientists to reconsider their previous opinions. The fact is that the appearance of bilateral symmetry is noted 40 million years earlier than anticipated. This suggests that nature created more adapted multicellular creatures long before the first inclinations of man appeared. It cannot be said that the latter acquired all the positive elements that bilateral symmetry could give him, but without them he could not survive.
Consider, for example, two eyes. Thanks to them, humans and animals can look at the world around them as a three-dimensional space. They can determine how close or far a particular subject is to them. It should be noted how binocular vision is useful for predators, because without it they will not be able to catch prey, which means that their survival will remain in question. Herbivores do not stand aside , their eyes are located on both sides of the head, which allows them to fully examine the area around them. This greatly reduces their chances of becoming a predator's prey. Two ears allow not only to hear the sound, but also to determine its source. Two legs help to move quietly, without losing balance.
Thus, speaking about what symmetry is, one cannot ignore its useful qualities. Indeed, if nature had not rewarded us with them, then our existence would have long ceased.