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The history of life on Earth traces the processes by which living and extinct organisms evolved, from the earliest emergence of life to the present day. Earth formed about 4.5 billion years ago (abbreviated as Ga, for gigaannum) and evidence suggests that life emerged prior to 3.7 Ga. [1] [2] [3] The similarities among all known present-day species indicate that they have diverged through the ...
539 Ma – present. The Phanerozoic Eon (Greek: period of well-displayed life) marks the appearance in the fossil record of abundant, shell-forming and/or trace-making organisms. It is subdivided into three eras, the Paleozoic, Mesozoic and Cenozoic, with major mass extinctions at division points.
The last universal common ancestor (LUCA) is the hypothesized common ancestral cell from which the three domains of life, the Bacteria, the Archaea, and the Eukarya originated. The cell had a lipid bilayer; it possessed the genetic code and ribosomes which translated from DNA or RNA to proteins. The LUCA probably existed at latest 3.6 billion ...
Castro (surname) Castro family coat of arms (Portugal). Castro is a Castilian surname popular in Spanish and Portuguese countries, coming from Latin castrum, meaning a castle or fortress. Its English equivalent is Chester .
The name in Ireland has several diverse origins, resulting in widely dispersed clusters of the name in South Western, Western (Galway) and North Eastern Counties. [5] One recognized root was the anglicization of the Irish surname "Ó Laoidigh" which resulted in several variants, such as Lee, Lea, and Maclee. [6]
Martínez (often spelled without the acute accent on the "I") is a common surname in the Spanish language. Martínez is the most common surname in the Spanish regions of Navarre, La Rioja, Cuenca and Murcia. There are also variations such as San Martin and Martín (with an accent on the "i"). It originated as a patronymic surname, meaning "son ...
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