Many, many years ago, when the Earth was still young and rampant, there was only an ocean and the land was in little pieces torn by volcanoes and quakes. At that time noone wanted to live on Earth and she wanted this so much.
In a happy moment He decided to give the little blue planet a chance and told her: 'Earth, you are still quite young, however reasonable life needs care and conditions. Will you manage to sustain it?'. 'Yes! - answered she immediately - but what care, what conditions? I know absolutely nothing, I have absolutely nothing!'. 'You have! - said He - You are flooded with light. A sparkle of life wll come to you and this sparkle will need only light to live. For it's time the light to begin producing matter on the Earth. If you take a good care of this seed, it will take care of you too. It will teach you what is to sustain life, it will change you so much that later all the rest will also come to live on you. And because everything will be owing to the light, someone will later call them "creatures of the light". And they will stay until the light is here.
In such a way on the Earth came these divine sparkles that later were named "blue-green algae" or "cyanobacteria". Simple unicellulars, the only ones who are able to live on light. Only they can use the light to break the mollecule of the water and to use the liblerated energy for living. Their ancestors live today in the water and on the land. Their ancestors are also the little cell organelles called chloroplasts, responsible for the photosynthesis in the plants of nowadays.
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