Concept explainers
WRITE ABOUT A THEME: INTERACTIONS Animal life changed greatly during the Cambrian explosion, with some groups expanding in diversity and others declining. Write a Short essay (100-150 words) interpreting these events as feedback regulation at the level of the biological Community.
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Chapter 32 Solutions
Modified Mastering Biology with Pearson eText -- Standalone Access Card -- for Campbell Biology (10th Edition)
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Anatomy & Physiology
- LOOK AND ANALYZE AT THE ILLUSTRATION BELOW. THE ANSWER WILL BE BASED ON THE ILLUSTRATION For about how many years of geological time have the dinosours existed on earth?? Did dinosours exist at the same time as humans? How do scientists determine when an era begins and when it ends? What is the purpose of making a geological timelinearrow_forwardDuring the Precambrian, _______. a. atmospheric oxygen concentration declined b. bacteria, archaea, and early eukaryotes arose c. dinosaurs became extinct d. all of the abovearrow_forwardThe first interval of Earths existence is called the ________. a. Cambrian c. Proterozoic eon b. Hadean eon d. Archean eonarrow_forward
- Which of the following was not present by the end of Precambrian? a. archaea c. fungi b. bacteria d. fisharrow_forwardThe fossil record (a) usually occurs in sedimentary rock (b) sometimes appears fragmentary (c) is relatively complete for tropical rainforest organisms but incomplete for aquatic organisms (d) a and b (e) a, b, and carrow_forwardBirds and mammals are endotherms. They maintain body temperature by producing heat through metabolism. Endothermy is energetically expensive for an organism, yet endotherms have become the dominant group of tetrapods. What is a major evolutionary advantage of endothermy? A. Endothermy allows greater independence from water. B. Endothermy decreases the amount of time an animal spends hunting or foraging. C. Endothermy widened the range of habitats available and increased speciation. D. Endothermy allows more body resources to be used for growth and reproduction.arrow_forward
- The term “Cambrian explosion” refers to (a) an increase in biodiversity. (b) a mass extinction. (c) an atmospheric detonation due to increasing gas concentrations. (d) an oceanic eruption caused by underwater volcanic activity.arrow_forwardSubject (Biology - Ecology) Discuss the relationship of predation in the extinction of some animals. Cite 3 examples where a whole species of an animalwas wiped out because of their predators.arrow_forwardThe extinction of dinosaurs left gaps in the early ecosystems on earth. Explain briefly the aftermath of the dinosaurs extinction in connection with other animal groups.arrow_forward
- A. What do scientists think the primitive Earth was like? Give 3 evidences. B. How could life possibly evolve in such an inhospitable environment?arrow_forwardWhy was it believed that life began in the seas and not in land or air? * Land and air were inhospitable places for life during the Hadean Eon. Land and air were inhospitable places for life during the Archean Eon. Land and air were inhospitable places for life during the Phanerozoic Eon. Land and air were inhospitable places for life during the Proterozoic Eon.arrow_forwardOne type of fish fossil is found only in a rock layer near the bottom of a canyon, while a different kind of fish fossil is found only in a rock layer 4,000 feet higher, near the top of the canyon. Which statement would a scientist most likely offer to explain this situation? A.) The fish in the lower layer lived in the deep sea. While the other fish lived in shallow water. B.) The fish in the upper layer lived a healthier life than the other fish. C.) The rock in the lower layer is denser than the rock in the upper layer D.) The rock in the upper layer must have formed in freshwater E.) The fish in the upper layer lived more recently than the other fish. The Geologic Time Scale is a systematic chronological dating process that relates geological strata to time. This methodology is commonly used be geologists, paleontologists, and other Earth scientists to describe the timing and relationships of events that once occurred in history. Which of the following statements can be…arrow_forward
- Biology: The Dynamic Science (MindTap Course List)BiologyISBN:9781305389892Author:Peter J. Russell, Paul E. Hertz, Beverly McMillanPublisher:Cengage LearningBiology (MindTap Course List)BiologyISBN:9781337392938Author:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. BergPublisher:Cengage Learning