Among the sedimentary rocks with an age of 3.100 million years can be found stratum that correspond to marine precipitation of iron oxide.

This fact implies the existence of large quantities of oxygen dissolved in the seawater, which in turn implies the existence of an oxygen-rich atmosphere as these concentrations tend to balance and it becomes impossible to have a high concentration of oxygen in the sea with a low concentration of oxygen in the atmosphere.

However, in the primitive atmosphere of 4,400 million years ago there was no free oxygen and this implies the development of a mass phenomenon oxigenogenia.

At present the production of free oxygen is due to the action of the chloroplasts from green algae, green blue and cells of multicellular plants, and when we look at its structure conclude that it is cell associated by the current endosimbiosis eukaryotic plant cells. From this we conclude that chloroplasts are older and at some point in their evolutionary development were free cells.

Current chloroplasts are organulles with a double membrane, with ability to reproduce, and these facts are signs of their existence as free primitive cell. Furthermore, inside of the membrane, chloroplasts contain DNA and ribosomes with an organulle called "thylakoids" which consists of a photosensitive pigments rich membrane capable of capturing light energy and transforming it into chemical energy for the synthesis of carbohydrates resulting free oxygen production as waste material.

The existence of free chloroplasts before (-) 3.100 million years would explain the early oxigenogenia would alter the Earth's atmosphere.

However in Veterinary Digital Disclosure we are also interested to note another fact:

"If the presence of free chloroplast, prior to the existence of eukaryotic plant cells is demonstrated by the production of oxygen can also consider that the presence of free chloroplasts is the cause of the existence of carbohydrates as an energy source.

It is from this point when the existence of mitochondria that will result in the animal cell and its function is to obtain energy from carbohydrates produced in chloroplasts is justified "

Expressed in terms of DNA, "the function of the chloroplast DNA produces thylakoid that produce carbohydrates. As a consequence another DNA can express the originating mitochondria which plant nutrients will use. These prokaryotic mitochondria by endosymbiosis and would associate would result in animal cells " This is the first contribution to the demonstration of the postulate 3 and 5 of the hypothesis pronutrients in the theory of evolution: 3 Thus there are mechanisms for "off" and "on" from reading of specific genetic material that can be based on a pre-programming of genetic information own system of or by the influence of substances in food "and 5" Certain plant nutrients may constitute biochemical signals "on" switches reading genetic information existing in a state of lethargy. "