La Explosion Cambrica

For 3.5 billion years ecosystems were extremely simple and low in biodiversity Bacteria algae and finally soft worm-shaped small animals inhabited seas in which free oxygen was present It was very scarce I think one of the great discoveries of 20th-century science is the recognition of the existence of life on this planet As soon as it could be physically sustained With the explosion of biodiversity which lasted about 20 million years An unprecedented ecological phenomenon emerged predation This became possible with the appearance and development of the skeleton Hard parts could be used both to attack prey and to defend against potential enemies The simultaneous appearance of skeletons in different groups suggests that significant environmental changes occurred Geological data indicate at in the Early Cambrian there was a significant increase in dissolved substances in seawater such as phosphate and CO2 consequence of intense volcanism and dissolved free oxygen It should be considered that oxygen in the atmosphere It is an element that accumulates through the fabric of life Once life appears on the planet It is she who is responsible for producing free oxygen and this accumulates over time Where can the traces of this primitive life be found The planet's geology through colossal orogenic forces brought to light various Cambrian deposits With exceptionally preserved fossils in four continents The first findings were made on the western coast of Wales in the United Kingdom on this rocky wall of St Davis The Cambrian period takes its name from the Roman term for Wales Cambria which in Welsh is Cambri quite similar And it was precisely here on the most western coast of Cambria or Wales that the major protagonists of the Cambrian appeared rilobites So far around 30 000 different species of trilobites have been cataloged Although an estimate of the total could reach up to 100 000 species of this type of animal Trilobites are primitive extinct arthropods from the Paleozoic era Their body is divided transversely In a head or cephalon in numerous segments of the thorax and in a tail or pygidium From a longitudinal perspective It is divided into three lobes The Cambrian seas were not inhabited only by trilobites although that is the most widely disseminated image The ocean floors were full of unusual animals and plants We know of their existence mainly thanks to To a dozen sites that have provided exceptionally well -preserved fossils These large deposits have in recent years been joined by the one at Murero in the province of Zaragoza This site is considered the Sistine Chapel of trilobites Such is the quantity and variety of its findings One of the determining factors To understand the rapid evolution of trilobite species it is the acquisition of sexual reproduction Here in Murero The oldest evidence of sexual dimorphism has been found We can somewhat assert that That sex began in the Cambrian