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Jan 1, 1450
CREATIONIST THEORY
Belief in the supernatural origin of the universe or of humans and other living things, especially as based on the literal interpretation of the account of the creation related in the Bible. -
Lamarckism
Chevalier de Lamarck took a great conceptual step and proposed a full-blown theory of evolution in 1801. He argue that life was not fixed. When environments changed, organisms had to change their behavior to survive. He based his theory in giraffes, believed that the long necks of giraffes evolved as generations of giraffes reached for ever higher leaves. -
Alfred Russel Wallace
He is best known for independently conceiving the theory of evolution through natural selection; his paper on the subject was jointly published with some of Charles Darwin's writings in 1858. -
Darwin's Theory of Evolution
It is established that it is the process by which organisms change over time as a result of changes in heritable physical or behavioral traits. Changes that allow an organism to better adapt to its environment will help it survive and have more offspring.
When he published about apes and humans remained controversial. -
SPONTANEOUS GENERATION THEORY
The idea was that life could come from nonliving things. In the fourth century B.C., the Greek philosopher and scientist Aristotle argued that abiogenesis is one of four means of reproduction
Spontaneous generation is the incorrect hypothesis that nonliving things are capable of producing life
Pasteur's experiment is one of the last and most important experiments disproving the theory of spontaneous generation. This theory lacks evidence, hence it was discarded. -
Biogenesis
The law of biogenesis, attributed to Louis Pasteur, in 1861, is the conclusion that complex living things come only from other living things, by reproduction. That is, modern life does not arise from non-living material, which was the position held by spontaneous generation. "All life is from life" -
PANSPERMIA THEORY
The first known mention of the concept of panspermia was in the writings of the Greek philosopher Anaxagoras (500 BC – 428 BC), although his concept differs from the modern theory. It was supported by Hermman Richter but it was until 1903 when Svante Arrhenius won the Chemistry Nobel Prize. This theory lacks evidence, hence it was discarded. -
Endosymbiotic
Konstantin Mereschkowsky first suggested the idea of plastids originating as endosymbionts in 1910. He was the first to formulate the idea of symbiogenesis, which argues that symbiosis is the main driving force of evolution. Later, he collaborated with Ivan Wallin, and he was the one who suggested the idea that the eukaryotic cell was composed of microorganisms. So the creation of a species can happen through endosymbiosis. -
Physcal-Chemical
According to this theory, origin of life on earth is the result of a slow and gradual process of chemical evolution that probably ocurred 3.8 billion years ago.
It was proposed by two scientist, A.I.Oparin in 1923, and J.B.S Haldane in 1928.
Essentialy, life arose from the water vapor carried by the volcanic activity, in the early life of our planet. This way the first oceans appeared. Particles started accumulating in surface and started combining into ever-more-complex molecules -
The Alvarez Hypothesis
The "extrinsic catastrophists"
discovered that sedimentary layers found all over the world at the K–T boundary contain a concentration of iridium hundreds of times greater than normal. and concluded that one or more giant asteroids impacted the earth, causing an angular shift in the earth's axis, global floods, fire, atmospheric occlusion and causing extinction of the dinosaurs -
Flood Basalt Volcanism
Courtillot, 1994
Some flood basalts do not match with any indicators of serious system stress, and some small mass extinctions do not appear to correspond with any flood basalts. This may be because it is unlikely that there is one single cause for all mass extinctions. -
CONCLUTION HOW IT AFFECT US
With all these theories we can conclude that the've passed so many years and we still don't know our certain origin. It affect us because even not all of this theories were right, it help us to question ourselves in a more delimited way. Also they've helped us to evolve as humans, as societies, applying the knowledges principally at our labs nowadays. -
LIVING BEINGS AND BIOLOGY
Life is something we only have in this planet, we have a lot of biodiversity and biology has an important role in our lifes. Thanks to that, we are able to know characteristics of almost everything that is around us, it continously help us to find cures and stuff.
