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II. Multiple ChoiceThe internal blood osmolarity of hagfishes living in full-strength seawater would beA. hyperosmotic to seawaterB. hypoosmotic to freshwaterC. isosmotic to seawaterD. A or B, depending on temperatureWhich of the following sensory systems likely has the greatest effective distance? Which of the following is NOT considered a defining characteristic of the Class Myxini?Which wavelength of visible light would likely penetrate water to a greater depth?III. True/False_F_ The blood osmolarity of lampreys living in freshwater would be higher than the blood osmolarity of bony fishes living in seawater.V. Fill in the blanks with the appropriate term. The earliest known vertebrates belonged to the Superclass ____Agnatha________________. List 2 characteristics of the pteraspidomorphs that may have contributed to the extinction of ostracoderm fishes:
List 3 defining characteristics of fishes belonging to the Class Myxini. ____VII. Short Answers 1.Why are tunas and lamnid sharks considered ‘endotherms’ rather than ‘homeotherms’? Why isendothermy so difficult for fishes to accomplish ? Why do so few fishes display this ability?