A classic example of wildlife mismanagement is the North American bison, which was brought close to extinction in the 19th century. What are the two major reasons it almost became extinct? A)
Disease brought by European animals and sustained by drought almost killed the bison.
B)
War between settlers and tribes, and drought dwindled the numbers to almost zero.
C)
Bison hides had become fashionable as hats, causing a war between settlers and the tribes who were dependent on the bison for existence.
D)
Prairie dogs spread the plague across the Great Plains.
E)
none of the above

Juan and carol were studying invertebrates in biology. they knew that segmented or earth worms preferred a dark, moist habitat. during this lab, they would be investigating the responses of organisms called planaria or dugesia tigrina. these were simple flatworms that still had a one-way digestive system and a very simple nervous system. juan and carol placed the planaria in a petri dish containing cool, distilled water that was partially covered with black paper. they shined a light on the dish. next, they removed the paper and placed a small amount of chicken liver at one end of the dish. they added a few large salt crystals to the water. finally, they added drops of hot water to the cool water in the petri dish. their results can be seen in the data table. according to their experiment, all but one conclusion is valid.