【正文】 s jaw able to do?Send rapid clicking sounds into waterIncrease the speed of soundsReceive sound waves that have reflected off objectsForce water through the nasal sacs and out the blowhole27. How does the professor organize the information in the lecture?By describing a phenomenon and the physical structures that make it possibleBy describing several of the dolphin’s senses and their relative usefulnessBy contrasting how the dolphin makes two different types of soundsBy describing an old theory and then a new theory28. Why does the professor say this:To find out whether students are familiar with the lecture topicTo mention a related topic that will not be discussed in detailTo mention a mon misconception about dolphin vocalizationsTo point out a primary function of dolphin blowholesTPO 2466. What does the professor mainly discuss?Factors that affect successful crocodile municationSome reasons for crocodile vocalizationsWays that newborn crocodiles learn to municateReasons why crocodile vocalization is difficult to study7. According to the professor, what are two functions of the sounds made by male alligators? Click 2 answersTo frighten predatorsTo attract matesTo locate hatchlingsTo threaten other males8. Based on the discussion, what is one reason hatchlings make vocalizations to their mother while they are in the nest?To reassure her that they are safeTo signal that they are ready to follow herTo make sure she does not forget themTo indicate that they need to be relocated to a larger nest9. What is the professor39。s speed.The cheetah dispersed the seeds of plants that the antelope needed to survive.The cheetah caused the antelope to migrate out of the western United States.26. What point does the professor make when she discusses the maclura tree?The feeding habits of large animals could help revive some diminishing plant species.The climate has changed in North America since the Pleistocene epochMass extinctions of animals are generally preceded by mass extinctions of plants.The maclura tree has changed very little since the Ice Age.27. Why does the professor say that plants and small animals have continued to evolve since the Pleistocene?To indicate why the western United States is well suited for Pleistocene rewildingTo suggest a way to balance an ecosystem using Pleistocene rewildingTo identify a potential problem with the Pleistocene rewilding conceptTo explain how the idea for Pleistocene rewilding came about28. What does the professor mean when she says this:Pleistocene rewilding has been tried before without successPleistocene rewilding should be tried with just a few speciesPleistocene rewilding has already been thoroughly researchedPleistocene rewilding is another form of human interference.PO 23 Lecture 323. What is the lecture mainly about?Parts of the dolphin’s anatomy that allow it to navigateTwo different types of munication used by dolphinsThe way that dolphins store air while swimming underwaterThe meanings of different signals used by dolphins24. Why does the professor discuss the speed at which sound travels?To describe why sounds made under water can travel long distancesTo show why a person cannot hear a dolphin well when it is under waterTo pare the speed of two different sounds made by dolphinsTo explain how sound waves behave when crossing from one medium into another25. What is the dolphin39。?A proposal to identify all the animals that became extinct dining the Pleistocene epochA strategy for reintroducing native plants to an ecosystemA process for identifying alternative habitats for large animalsA proposal to recreate features of ecosystems of the Pleistocene epoch24. According to the professor, what are the two main goals of Pleistocene rewinding? Click on 2 answersTo restore some evolutionary processes that ended during the Pleistocene epochTo help prevent the extinction of certain species of mega faunaTo increase populations of native animal species in the western United StatesTo create a living laboratory where animal interactions can be observed25. According to the professor, how did the American cheetah influence the pronghorn antelope during the Pleistocene epoch?The cheetah prevented the antelope39。 physical characteristics?It can show the relationships only among a small number of animal species.It requires technology that is not widely available.It cannot account for characteristics that first appeared in the recent geologic past.It cannot determine whether similar characteristics developed in similar ways.9. According to the professor, in what way do colubrid snakes differ from other venomous snakes?Colubrids did not evolve from lizards.Colubrids do not use venom to catch their prey.The front teeth of colubrids are much larger than those of other venomous snakes.Colubrids produce a much stronger type of venom than other venomous snakes do.10. Why does the professor mention the brown tree snake?To support a hypothesis about the evolution of constrictor snakesTo support a hypothesis that venomous snakes evolved from constrictor snakesTo give an example of a snake species that was never venomousTo give an example of a type of snake that can change its color11. What is the professor39。s internal organs thaw before its outer skin thaws.Thawing occurs when the frog39。 To indicate that there is more than one explanation for a phenomenonTPO15 Lecture 429. Why does the professor discuss the exploration of hydrothermal vents?To show how the exploration helped researchers to determine the position of ocean water.To show how the exploration challenged an assumption about biological munities.To pare two peting theories concerning chemosynthesis.To pare the life cycle of underwater plants to the life cycle of underwater animals.30. What are three of the conditions o