Mammals excrete nitrogenous waste primarily as urea, which is water-soluble, in liquid urine. Birds and reptiles excrete it primarily as solid uric acid, which is not water soluble. How could this possibly be adaptive, given that it takes more energy to convert excess nitrogen into uric acid than it does to produce urea

The first amino acid of a new polypeptide chain is

Select the correct answer from each drop-down menu. which phase of mitotic division is the highlighted cell undergoing? the cell is undergoing , which is the stage before .

Scientists are conducting a study on the effectiveness of a new drug on memory loss. they are giving some of the test subjects the new drug to find out if it improves their long-term memory. which are possible limitations of this study? check all that apply. a) test subjects may want to participate in additional experiments. b) test subjects may think they should be paid more. c) test subjects may get bored and want to quit early. d) test subjects may have to travel during the experiment. e) test subjects may have full-time jobs. this is multiple choice. you for the !