Which of the following statements BEST describes the function of the large ears of an elephant? A-The elephant's ears can be nearly 2-meters long.
B-The ears help the elephant cool itself on a hot day.
C-The elephant's ears have many blood vessels close to the surface.
D-Elephant's ears consist of thin layers of cartilage and skin.

well in order to answer this question you have to provide more information < 3

"you start with 15.67 g mgco3-xh2o, when heated and all the water is removed, you are left with 7.58 g mgco3 only.

therefore, you had 15.67 - 7.58 = 8.09g h2o  

moles of each :

7.58g mgco3 = ? moles = 7.58g / 83.4g/mole = 0.09moles  

8 09g h2o = ? moles = 8.09g / 18g/mole = 0.44moles  

molar ratio between the two by dividing both numbers by the smallest number :

0.09 / 0.09 = 1  

0.44 / 0.09 = 4.8  

mgco3-5h2o"