Biology 2e
2nd Edition
ISBN: 9781947172517
Author: Matthew Douglas, Jung Choi, Mary Ann Clark
Publisher: OpenStax
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Textbook Question
Chapter 27, Problem 27CTQ
How is it that most if not all, of the extant animal phyla today evolved during the Cambrian period if so many massive extinction events have taken place since then?
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Chapter 27 Solutions
Biology 2e
Ch. 27 - Figure 27.5 If a Hox 13 gene in a mouse was...Ch. 27 - Figure 27.6 Which of the following statements is...Ch. 27 - Figure 27.9 Which of the following statements...Ch. 27 - Which of the following is not a feature common to...Ch. 27 - During embryonic development, unique cell layers...Ch. 27 - Which of the following phenotypes would most...Ch. 27 - Which of the following organisms is most likely to...Ch. 27 - Which of the following is not possible? radially...Ch. 27 - An animal whose development is marked by radial...Ch. 27 - Consulting the modern phylogenetic tree of...
Ch. 27 - Which of the following is thought to be the most...Ch. 27 - As with the emergence of the Acoelomorpha phylum,...Ch. 27 - Which of the following periods is the earliest...Ch. 27 - What type of data is primarily used to determine...Ch. 27 - The time between 542-488 million years ago marks...Ch. 27 - Until recent discoveries suggested otherwise,...Ch. 27 - Plant life first appeared on land during which of...Ch. 27 - Approximately how many mass extinction events...Ch. 27 - Why might the evolution of specialized tissues be...Ch. 27 - Describe and give examples of how humans display...Ch. 27 - How have Hox genes contributed to the diversity of...Ch. 27 - Using the following terms, explain what...Ch. 27 - Explain some of the advantages brought about...Ch. 27 - Describe at least two major changes to the animal...Ch. 27 - How is it that morphological data alone might lead...Ch. 27 - Briefly describe at least two theories that...Ch. 27 - How is it that most if not all, of the extant...
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- Which major groupings of animals defined on the basis of morphological characters have been confirmed by molecular sequence studies?arrow_forwardSegmentation has evolved several times and occurs in most animal supergroups. What advantages do segmented taxa have over their unsegmented relatives?arrow_forwardHow has the abundance and diversity of Bivalves clade changed over time? –How did the synapomorphies of the clade allow the group to diversify and expand? Has the clade been affected by mass extinction events, either positively or negatively? If so, what caused the extinction event? Is the clade now at its most diverse and abundant? Or if that was in the past, when? If still extant, are species in the clade thriving or threatened with extinction?arrow_forward
- 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.arrow_forwardAll 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 innovationarrow_forwardWhat makes Archeopteryx an important fossil evolutionarily? This species has a mix of characters that suggest it was a "transitional" species between two large groups, dinosaurs and birds. This species is the oldest known, universally agreed upon, fossil of life, and therefore tells up what the common ancestor to all living things might have been like. This species is thought to be the last common ancestor between chimps and humans, and therefore is the root of our own specific group (homonins). This species has a mix of characters that suggests is was a "transitional" species between two large groups, fish and amphibians.arrow_forward
- a)Describe key developments related to primate evolution associated with the time periods below: Palaeocene: Eocene: Oligocene: Miocene: b)List plausible descendants to these ancestral primates: Omomyyoid: Adapiform: Aegyptopithecus: Khoratpithecus: Proconsul:arrow_forwardHow does the presence of gill slits in all vertebrate embryos support the theory of descent from a common universal ancestor?arrow_forwardIn 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?arrow_forward
- 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 EUKARYOTESarrow_forwardEvolution in Humans 1) explain how fossil evidence is used to reconstruct the hominid history 2) explain how genetic evidence is used to document changes in species and populations over time 3) describe several techniques that paleontologists today use to establish fossil agearrow_forwardA 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.arrow_forward
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