Bio 121 Campbell Biology Truman College
17th Edition
ISBN: 9781323670637
Author: Urry, Cain
Publisher: PEARSON
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Chapter 32, Problem 3TYU
Summary Introduction
Introduction: Cambrian explosion lead to the sudden diversification of the amimal species. Cambrian explosion actually consist of the three explosion in which several morphological (novel adaptations in prey predator), geological (increase in oxygen level) and genetic mutations and duplications occurred (Hox genes).
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Chapter 32 Solutions
Bio 121 Campbell Biology Truman College
Ch. 32.1 - Summarize the main stages of animal development....Ch. 32.1 - WHAT IF? What animal characteristics would be...Ch. 32.2 - Put the following milestones in animal evolution...Ch. 32.2 - VISUAL SKILLS Explain what is represented by the...Ch. 32.2 - MAKE CONNECTIONS Evaluate whether the origin of...Ch. 32.3 - Distinguish the terms grade and clade.Ch. 32.3 - Compare three aspects of the early development of...Ch. 32.3 - Prob. 3CCCh. 32.4 - Prob. 1CCCh. 32.4 - WHAT IF? Suppose ctenophores are basal metazoans...
Ch. 32.4 - Prob. 3CCCh. 32 - Prob. 32.1CRCh. 32 - What caused ihe Cambrian exploston? Describe...Ch. 32 - Describe how body plans provide useful Information...Ch. 32 - Prob. 32.4CRCh. 32 - Prob. 1TYUCh. 32 - The distinction between sponges and other animal...Ch. 32 - Prob. 3TYUCh. 32 - Prob. 4TYUCh. 32 - EVOLUTION CONNECTION A professor begins a lecture...Ch. 32 - SCIENTIFIC INQUIRY INTERPRET THE DATA Redraw the...Ch. 32 - WRITE ABOUT A THEME: INTERACTIONS Animal life...Ch. 32 - SYNTHESIZE YOUR KNOWLEDGE This organism is an...
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- 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 oceansarrow_forwardWhich statement is true about fossilization? (A) (B) (C) (D) Only animals with backbones (vertebrates) fossilize. Only animals with hard structures, such as bones or shells, fossilize. Animals always fossilize, but plante fossilize under certain conditions. All organisms fossilize, depending on the environmental conditions.arrow_forwardCarbon-14 dating works for fossils up to about 75,000 years old;fossils older than that contain too little 14C to be detected. Mostdinosaurs went extinct 65.5 million years ago. (a) Can 14C be usedto date dinosaur bones? Explain. (b) Radioactive uranium-235 hasa half-life of 704 million years. If it was incorporated into dinosaurbones, could it be used to date the dinosaur fossils? Explainarrow_forward
- The Age of Reptiles corresponds to the (a) Paleozoic era (b) Mesozoic era (c) Cenozoic era (d) Pleistocene epoch (e) Permian periodarrow_forwardWhich 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_forwardMammals, like humans and apes, have 5 digits on their fore and hind limbs. Modern horses have 1. How might you recontrust the ancestral state of mammal tow number?a) investigate the number of toes on all extant horses and apesb) investigate the number of toes for other mammals and use parsimony to deduce the ancestral statec) investigate the number of toes for an outgroup that is closely related to mammals, for example reptiles or amphibiansd) either b or ce) all of the abovearrow_forward
- Why is animal evolution during the early Cambrian referred to as an “explosion”?arrow_forwardWhat is plausible evidence supporting the hypothesis that birds evolved from dinosaurs? Please choose the best option. a) Dinosaurs and birds are both predatory.b) Fossilized transitional forms are discovered that possess features of birds and dinosaurs yet are difficult to classify into either group.c) The wing structure of a bird is similar to a dinosaur.d) Bird fossils can be found alongside dinosaur fossils.arrow_forward(1) What is the most common way for a dead organism to avoid decomposition? (2) Why do researchers look for fossils in places that are now dry and barren instead of other places like forests or grasslands? (3) What kind of dating from the lecture or textbook would be the best method for finding the number of years ago when a volcanic rock was formed? (4) Why is the pelvis of a biped shorter and wider than the pelvis of a quadruped? (5) Does the overall shape of Lucy’s pelvis resemble the human pelvis or the chimpanzee pelvis more? Do not think of the size, but compare the outlines of each bone. This is Lucy's skelton below.arrow_forward
- "Vertebrae" would be an example of an: I) autapomorphy II) plesiomorphy III) synapomorphy IV) symplesiomorphyarrow_forwardThe 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?arrow_forward375 million years ago, the population of organisms we call Tiktaalik had variation in many aspects of the appendages including the bones, muscles and nerves. What evolutionary force was likely most responsible for rapid adaptation and the relatively rapid evolution of limbs in this lineage? (A) natural selection (B) NONE of these C) mutations D genetic drift (E) speciationarrow_forward
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