Читать книгу The History of almost Everything. Practical guide of the eaters of Time - Lim Word - Страница 4

Our Earth, according to a widespread theory, originated from a protoplanetary disk, around this time. Strangely enough, the first, primitive forms of life, nuclear-free cells, prokaryotes, appeared almost almost immediately after the termination of the devastating asteroid bombardment (the eon of Qatarhei, 600 million years), as well as education, as a result of a terrible sliding strike on our planet, an object the size of Mars, the future companion of all lovers, the Moon. However, for another long and a half billion years, the stage of development, called Archean, life forms do not develop much. The top of this demiurgic process is unicellular eukaryotes and already relatively complex algae visible to the naked eye.

All these organisms, presumably, have a single, universal common ancestor. The genetic set of all living things on Earth is the same. Their DNA is assembled from four nucleotides (biological molecules) – adenine, guanine, cytosine and thymine.