The Cambrian explosion is a conundrum: how can the long prior history of the phyla, revealed by molecular divergence, be reconciled with their absence, and then sudden appearance, in the fossil record?
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Q: what does the Cambrian “explosion” refer
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Q: What is the “Cambrian explosion,” and why is it significant?
A: Cambrian period refers to the initial geological period of the Palaeozoic Era as well as Phanerozoic…
Q: The Cambrian Explosion occurred approximately 542 million years ago. During the Cambrian, what…
A: Cambrian period refers to the initial geological period of the Palaeozoic Era as well as Phanerozoic…
Q: ''Cambrian Explosion'' What contributed to this explosion of life? What were Earth conditions like…
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Q: Why will the fossil record always be incomplete?
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Q: 4. Give at least 2 major contributions of Cambrian explosion to evolution
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Q: All of the following have been suggested as triggers for the Cambrian radiation of complex metazoans…
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Q: What environmental condition may have contributed to the Cambrian explosion?
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Q: What is the "Cambrian Explosion" and why is it significant?
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Q: What you mean by living fossils?
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Q: What caused the Cambrian explosion? Describe current hypotheses.
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Q: The Cambrian Explosion occurred approximately 542 million years ago. During the Cambrian, what…
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The Cambrian explosion is a conundrum: how can the long prior history of the phyla, revealed by molecular divergence, be reconciled with their absence, and then sudden appearance, in the fossil record?
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- Why is animal evolution during the early Cambrian referred to as an “explosion”?In the late 1800's, a biologist studying animal embryos coined the phrase, "ontogeny recapitulates phylogeny", meaning that the physical development of an animal embryo (ontogeny) seemed to retrace the changing form of the species during its evolutionary history (phylogeny). Why would embryonic development retrace evolutionary steps?Shade the geological time range for each fossilized organism, marking the time period where each fossil belongs to in a darker color (see example for fossil #2: Batostomella gracilis ): Fossil #7: Mucrospirifer thedfordensis Fossil #16: Cardioceras species Fossil #17: Dinosaur bone Fossil #21: Otodus species Fossil #23: Dentalium sexangulare Fossil #24: Physa humerosa
- Which of the following is true about the phylogeny of birds and reptiles. Question 35 options: a) Birds are more closely related to amphibians then they are to reptiles. b) Birds are a type of reptile, but are not related to dinosaurs. c) Birds and reptiles are the least related vertebrates. d) Birds are a type of reptile and are descended from a group of dinosaurs.All of the following have been suggested as triggers for the Cambrian radiation of complex metazoans except: perhaps the Cambrian metazoans outcompeted the Ediacaran metazoans, opening up new ecological niches to fill perhaps a series of fortuitsus genetic changes provided more raw material for natural selection to act upon perhaps increased oxygen in the world ocean promoted the evolution of complex body forms perhaps the rise in sea level that flooded the margins of the continents during the earliest Paleozoic created abundant new ecological niches, promoting biodiversity O perhaps the "arms race" between predator and prey spurred evolutionary innovationThe eon comprising the Cambrian period up to the present is called the (1). It is divided into three eras: Paleozoic, Mesozoic, and Cenozoic. The Paleozoic era, first (2) appeared. Finally, the Cenozoic era is where (3), flourished, lasting up to this day.
- Shows how modern organisms descended from common ancestors Structures that do not serve a function and are similar to those found in earlier organisms 1. Transitional Species Compares the age of fossils to each other based on the layers of rock they are found in 2. Vestigial structure 3. Fossil Record 4. Relative Dating Evidence of gradual change between a new species and its ancestor 5. Radiometric Dating Structures that related species have inherited from a common ancestor 6. Homologous Structures uses radioactive elements to narrow down the age of a fossil to a specific periodIt is known that it takes very long periods of time for new species to develop, and yet the fossil record for many organisms is characterized by long periods of Stasis (no change) followed by short bursts of intense Speciation (the disappearance of one species followed by the appearance of a new species). Thus in the fossil record, organisms seem to stay the same for long periods of time followed by a “sudden” change in the organisms (sudden with respect to evolution and geology). In other words, it appears that new species evolve suddenly as opposed to over long periods of time. The Theory of Punctuated Equilibrium helps to explain these seemingly contradictory occurrences in the fossil record. Discuss how Punctuated Equilibrium works (think about small offshoot populations that break off from the main population) and how it can explain the fossil record evidence. (Be sure to include information about why fossils of the offshoot population would be rare.)Which of the following is not a hypothesis used to describe the sudden change in the diversity of lifeforms observed in the Cambrian Period? a. Increased continental drift creating greater terrestrial landmasses O b. Predator-prey arms race due to evolution of locomotion and development of exoskeletons O c. Evolution of the Hox genes which regulate complex body plans O d. Rising sea levels, increasing the volume of area species could occupy e. Continental flooding driving increased nutrient and mineral flux in the oceans
- A 2015 article in Nature has summarized the early history of jawed vertebrates using highlights from recent discoveries and how they have changed our understanding of vertebrate evolution. https://www.sciencedaily.com/releases/2014/04/140416133336.htm Question: Given these recent discoveries, how should the cladogram below change? Describe it. It will likely be helpful to reference a synapomorphy noted on the cladogram.1) Does the fossil record indicate that life first appeared in the water or on the land? WATER or LAND 2) Does the fossil record indicate that invertebrates (trilobites) and vertebrates (fish) evolved during the same geological period? YES or NO 3) Does the fossil record indicate that birds evolved from mammals or reptiles? MAMMALS or REPTILES 4) The fossil record indicates that hominids evolved from an ancestral hominoid approximately? 4-5 million years ago or 1-2 million years ago What kinds of organisms appear earliest in the fossil record? PROKARYOTES or EUKARYOTESCartilaginous fishes made their first appearance in the fossil record between 444 and 419 MYA, which represents the starting and ending dates for the Carboniferous Period which represents the starting and ending dates for the Silurian Period which represents the starting and ending dates for the Cambrian Period which represents the starting and ending dates for the Jurassic Period which represents the starting and ending dates for the Devonian Period