Neurons have a relatively high and sustained demand for glucose. Unlike many other tissues, neurons are almost entirely dependent on glucose catabolism for energy, since most fatty acids do not cross the blood-brain barrier. Glucagon is a hormone that is released by specialized cells in the pancreas when blood sugar levels are low; glucagon activates a variety of metabolic responses to stabilize blood glucose levels. How would you predict that neurons respond to glucagon

Cladistics is a way of classifying organisms by examining the characteristics of their ancestors and descendants and depicting the relationships in a cladogram. which of the following best describes a challenge in classifying organisms this way? a. there are millions of species on earth, and a cladogram is not a practical means for classifying all of them. b. it is impossible to tell which organisms are most closely related to each other using a cladogram. c. cladograms are detail-oriented and do not provide a useful understanding of evolutionary relationships. d. there is a limited number of ways to organize the information, so most cladograms end up looking very similar.