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The T Rex

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Submitted By chichun
Words 504
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The topic is about the evolution condition of Cambrian explosion(Cambrian radiation) Cambrian explosion or Cambrian radiation was the relatively rapid appearance. It happened around 542 million years ago, of most major animal phyla, as demonstrated in the fossil record.

1. In the report of rates of Phenotypic and Genomic Evolution during the Cambrian Explosion, these seemingly impossibly fast rates of evolution implied by this Cambrian explosion have long been exploited by opponents of evolution. Moreover, the exact speed and nature of this grand adaptive radiation remain debated, and how to inferred from. Phenotypic differences among living organisms are addressed. Basically, the journal supposes that "Darwin's evolutionary theory" is correct first. Another hypothesis the report mentioned is that Cambrian radiation is perfectly consistent with Darwin's theory of evolution. The hypothesis is also assuming an Ediacaran origin for arthropods, phenotypic evolution was w4 times faster, andmolecular evolution w5.5 times faster, during the Cambrian explosion compared to all subsequent parts of the Phanerozoic. These rapid evolutionary rates are robust to assumptions about the precise age of arthropods(Michael S.Y. Lee, et al., 2013). 2. The research focused on arthropods (insects, crustaceans, arachnids and their relatives), that are the most diverse animal group in both the Cambrian period and present day. This study concerns arthropods, but the results are likely applicable to most of life. 3. In the report, the authors use records of fossils whose age is 515-million-year-old to present. These fossils lived during the Cambrian. The Cambrian is the first geological period of the Paleozoic Era, lasting from 541.0 ± 1.0 to 485.4 ± 1.9 million years ago (mya) and is succeeded by the Ordovician(). 4. Branches proportional to Molecular Change and Branches proportional to Morphological Change are taken to demonstrate the hypothesis. These experts here employed Bayesian and maximum likelihood phylogenetic clock methods on an extensive anatomical and genomic data set for arthropods.
If I found fossils that I don’t know how to compare the fossil to present organisms, I could use the result of Molecular Change and Morphological Change to demonstrate my theory. However, I do not know those methods that used in the report. I could grab fossils to professional labs and employed experts use the same methods to examine them. 5. Surprisingly, these fast early rates do not change substantially even if the radiation of arthropods is compressed entirely into the Cambrian (w542 mega-annum [Ma]) or telescoped into the Cryogenian (w650 Ma). The fastest inferred rates are still consistent with evolution by natural selection and with data from living organisms, potentially resolving ‘‘Darwin’s dilemma.’’ However, evolution during the Cambrian explosion was unusual (compared to the subsequent Phanerozoic) in that fast rates were present across many lineages. The data of this report support the hypothesis. Moreover, this study concerns arthropods, but the results are likely applicable to most of life. 6.

The report explains the sudden appearance of a plethora of modern animal groups in the fossil record during the early Cambrian period.

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