Campbell Biology in Focus, Books a la Carte Edition; Modified Mastering Biology with Pearson eText - ValuePack Access Card - for Campbell Biology in Focus (2nd Edition)
2nd Edition
ISBN: 9780134433769
Author: Lisa A. Urry, Michael L. Cain, Steven A. Wasserman
Publisher: PEARSON
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Textbook Question
Chapter 27, Problem 2TYU
Fossil steroid and molecular clock evidence suggests that animals originated
- A. between 710 and 770 million years ago.
- B. more than 100 million years before the oldest known fossils of large animals.
- C. during the Cambrian explosion.
- D. both A and B
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Chapter 27 Solutions
Campbell Biology in Focus, Books a la Carte Edition; Modified Mastering Biology with Pearson eText - ValuePack Access Card - for Campbell Biology in Focus (2nd Edition)
Ch. 27.1 - Prob. 1CCCh. 27.1 - Prob. 2CCCh. 27.2 - What is the Cambrian explosion? Why is it...Ch. 27.2 - Prob. 2CCCh. 27.3 - Prob. 1CCCh. 27.3 - WHAT IF? Would it be accurate to describe the...Ch. 27.4 - Prob. 1CCCh. 27.4 - Describe two key adaptations of aquatic...Ch. 27.4 - MAKE CONNECTIONS The radiation of bilaterians in...Ch. 27.5 - Describe two adaptations that have enabled insects...
Ch. 27.5 - MAKE CONNECTIONS Compare and contrast how the...Ch. 27.6 - Describe three key amniote adaptations for life on...Ch. 27.6 - Prob. 2CCCh. 27.6 - WHAT IF? Which came first, the chicken or the egg?...Ch. 27.7 - Describe how ocean communities changed in the...Ch. 27.7 - Prob. 2CCCh. 27.7 - Prob. 3CCCh. 27 - Prob. 1TYUCh. 27 - Fossil steroid and molecular clock evidence...Ch. 27 - Which of the following was probably the least...Ch. 27 - Prob. 4TYUCh. 27 - Prob. 5TYUCh. 27 - Prob. 6TYUCh. 27 - Prob. 7TYUCh. 27 - FOCUS ON EVOLUTION In Figure 27.29, circle the...Ch. 27 - FOCUS ON ORGANIZATION Early tetrapods had a...Ch. 27 - SYNTHESIZE YOUR KNOWLEDGE Collectively, do these...
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- The fossil nicknamed Lucy was a(n)a. early Homo.b. australopith.c. ardipithecine.d. modern human.arrow_forwardFossil insects many times larger than any insects alive today have been dated to the Carboniferous and Permian periods. These fossils are evidence that during these periods a. the climate was much warmer than it is today. b. the oxygen concentration of the atmosphere was significantly higher than it is today. c. the carbon dioxide concentration of the atmosphere was lower than it is today. d. insects had fewer competitors for food than modern insects. e. there were fewer predators on insects than there are today.arrow_forwardWhich of the following observations best supports the conclusion that two animal species evolved from a common ancestor in recent geological history? A The species are both herbivores. B The species have similar bone structure. C The species live in the same environment. D The species both obtain oxygen from the air. Choosearrow_forward
- Some epileptic conditions are due to neurons firing too often. This could be due to a lowering of the: Select one: a. threshold. b. set point. c. trigger point. d. cut off. The period of time during which an “explosion” of fossilized animals with bilateral symmetry are first found is the: Select one: a. Devonian. b. Jurassic. c. Cambrian. d. Ediacaran.arrow_forwardOne hypothesis for the Cambrian explosion was an increase in predator-prey relationships. It is thought that the resulting co-evolution of predator and prey may have been a factor in the rapid speciation of animals seen during this time. What findings in the fossil record would most support this? Group of answer choices a. increased incidence of larger-bodied animals b. increased incidence of sessile animals c. decreased incidence of animals with bilateral symmetry d. increased incidence of animals with radial symmetry e. increased incidence of shells, bony plates, spines, and/or clawsarrow_forwardFossilsa. are the remains and traces of past life.b. can be dated absolutely according to their location in strata.c. are usually remains of soft tissues, such as muscle.d. have been found for all types of animals except humans.arrow_forward
- Based on height calculations of Homo erectus fossils, biological anthropologists estimate that their average height was A. Similar to that of Australopithecines. B. Short, with most being approximately three feet. C. More than 70% taller than Homo habilis. D. Tall, within the range of modern humans.arrow_forwardDuring the ____ epoch, there were fewer ____ and more ____, a reversal in the relative representation of these forms during modern times. a. Eocene; omomyids; eosimiids b. Miocene; Old World monkeys; apes C. Miocene; apes; Old World monkeys d. Oligocene; apes; Old World monkeys e. Paleocene; New World monkeys; Old World monkeysarrow_forwardA. According to Gould and Vrba (1982), when the original cooling function of insect appendages was changed to flying, this is an example of a. inheritance. b. exaptation. c. apatation. d. adaptation. B. When primates first evolved away from their mammalian ancestors, they a. developed a larger and more complex brain. b. increased their reliance on the sense of smell. c. increased the number of canines (for meat-eating). d. all of the abovearrow_forward
- The phylogenetic tree of animals shows thata. rotifers are closely related to flatworms.b. both molluscs and annelids are protostomes.c. some animals have radial symmetry.d. sponges were the first to evolve from an ancestral protist.e. All of these are correctarrow_forwardWhich of the following statements is BEST supported by the phylogenetic tree? A The development of a bony skeleton was a significant evolutionary step for ocean-dwelling animals. B Most warm-blooded animals evolved to have hair, while cold-blooded animals did not. C Most land animals require a vertebral column, while ocean animals do not. D The evolution of the amniotic egg was specific to ocean-dwelling animals.arrow_forwardUntil recent discoveries suggested otherwise, animals existing before the Cambrian period were believed to be: a. small and ocean-dwelling b. small and nonmotile c. small and soft-bodied d. small and radially symmetrical or asymmetricalarrow_forward
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