SCIENCE

Reviewed by GL: This work waqs copied from a web page What are the theories of life generation?

THEORY 1

In the natural sciences, **abiogenesis**, or **origin of life**, is the study of how life on Earth could have arisen from inanimate matter. It should not be confused with evolution, which is the study of how living things change over time. Amino acids, often called "the building blocks of life", occur naturally, due to chemical reactions unrelated to life. In all living things, these amino acids are organized into proteins, and the construction of these proteins is mediated by nucleic acids. Thus the question of how life on Earth originated is a question of how the first nucleic acids arose.

Some facts about the origin of life are well understood, others are still the subject of current research. The first living things on Earth are thought to be single cell prokaryotes. The oldest ancient fossil microbe-like objects are dated to be 3.5 Ga (billion years old), just a few hundred million years younger than Earth itself.[1][2] By 2.4 Ga, the ratio of stable isotopes of carbon, iron and sulfur shows the action of living things on inorganic minerals and sediments[3][4] and molecular biomarkers indicate photosynthesis, demonstrating that life on Earth was widespread by this time. On the other hand, the exact sequence of chemical events that led to the first nucleic acids is not known. Several hypotheses about early life have been proposed, most notably the iron-sulfur world theory (metabolism without genetics) and the RNA world hypothesis (RNA life-forms).

THEORY 2

Theories on the origin of the life: One of the fundamental bases of the biology is the origin of the life on the Earth. The numerous hypotheses formulated as response can be summarized in four principal theories: creacionismo, spontaneous generation, theory of the panspermia and naturalistic theory. The creation: Still(Yet) in the middle of last century it was a widespread opinion that the life in the Earth had been created by a supernatural force, after the creative only(unique) act or to successive intervals. In addition, this theory was holding that each of the different species(kinds) had originated separately from others and that it(he,she) had not experienced any modification in the course of the successive generations (immobility of the species(kinds)). Provided that they cannot surrender to an experimental check, the foundations of the creacionismo are excluded from the field of application of the science and nowadays they are ignored by most of the scientific communit. How were these theories proved right or wrong?

Both theories are right becuse the first theory said that the life of generation is not theevolution and is right and the second theory said that life of generation is the theories on the origin of the life and the creation and this is right to.

Choose the theory you consider correct. Justify why.

Both theories are right but I think that theory 2 is more right because it said exactly the theory of life generation and the first don't.

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