Evolution of the species

Figure of Charles Darwin has survived to this day for being the person who wrote The origin of species, in which he warned us that the different animal species that walked on planet earth did not stop transforming over time to adapt to an environment that is also changing. But he would not be the only person who warned about this theory, before that person we will also find to a series of scholars who, like this one, thought that species were changing over time. Next in this lesson from a TEACHER we will focus on making you a summary of the evolution of the species.

Index

1. Meaning of the term EVOLUTION
2. The process of evolution in different species
3. The evolution of the Earth
4. Theories of evolution

Before we get into the subject as such, we must take into account what the word evolution means in the exact term. We define evolution as change, It doesn't have to be for the better or for the worse, it just means that a change takes place.

In fact, we will find favorable evolutions and unfavorable evolutions over time. Although this has been distorted over time and we will find the word evolution as something positive and involution for something negative, although this is a very absurd synthesis.

In this other lesson from a TEACHER we will discover the differences between Cro-Magnon man and Neanderthal.

We continue our summary on the evolution of the species going on to describe the different points that both Darwin and other scientists were describing after the different studies carried out and that later geophysics itself has given as valid.

There is a study that states that if there are two quite remote or isolated areas with the same species, each one of them will be completely different from the one installed in another region (even being the same species). This has been carried out in different places with the same ecological conditions such as the Arctic and Antarctica.

In a second moment a study on the great diversity of species that have survived to this day, studying their organs, we can get an idea of ​​the great similarity that exists between different animal species. It is not surprising that many of the organs of the pig for example are very similar to those of people, This is closely related to the way of reproduction of each species and the gestation time of each one of them. they.

We will find a third step taken by science in the anatomy studies that have been carried out in the different species and that have resulted in a series of documentation by which the vestiges of what could be extremities or organs that are not used today, but of which there are remains, so we will find the bone of the penis of human beings or the legs of snakes, among many others elements.

Continuing with the theme of the study of species, we will find the embryological study where it results in the existence of a common ancestor.

For all this we can say that the species evolution is given from a series of parameters that we will find in the environment and that together with a series of mutations in the gametes (which we will later mention) will result in the appearance of changes in the different species.

Image: blogger

As we all know, our planet has been changing over time form, that is, the continents as we know them today come from a fairly close origin: the fragmentation of Pangea (a single continent).

It seems that it was 3.8 billion years ago in the was Eorcaica when microbial elements began to appear due to climate change (the earth cooled). It will not be until 1500 million years ago when we will find the first eukaryotic cells, which came from the evolution of the previous ones, after this we will find that a series of multicellular elements such as algae, sponges, cyanobacteria, mucous fungi and myxobacteria among others…

We continue with this summary of the evolution of species, now talking about the different theories that have appeared throughout history on the subject of evolution. Here are the main ones:

Darwinism

The 19th century was a time quite influenced by science and its different theories. Within these we will find that of Charles Darwin, who made a study of the different species that he encountered throughout his journey aboard the Beagle. Within this theory we will find a series of important points such as:

• Any life evolves from a simple form.
• Species evolve due to the environment that surrounds them.
• This evolution occurs slowly and gradually.
• The extinction of a species comes from the hand of incompatibility with the adaptation to the environment that surrounds it.

Within this theory we will find the famous quote from "Only the strongest survive".

Neo-Darwinism

At the beginning of the 20th century we will find a new restructuring of the theory that came from the hand of George John Romane, where he eliminated Lamarck's theory definitively.

Lamarck

Scientist who was characterized by the evolutionary theory of effort, this is where we will put the typical example by which the giraffes that are known to have no such a large neck, they were stretching them with efforts to reach the area of ​​the trees. Obviously this theory never had many followers, because in this way the evolution of the species would have been much faster in time and today it would also continue.

Modern evolutionary theory

It is a synthesis where a large part of Darwin's theory enters, in which mathematical and biological explanations of the different species are made. In this it is explained to us that part of the evolution is given by mutational processes that occur during sexual reproduction, due to failures in the gametes.

Image: Slideshare

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