The answer is a eating disorder. Reason is because b,d and c are all physical disorders in which your mind has no control over. However eating disorders are usually caused by a form of stress or worry about somthing in your head that causes you to not want to eat
The answer is D, all of the above. Family roles fluctuate depending largely on societal norms and the personal preferences of the family.
Bat's need excellent hearing because without hearing they wouldn't be able to find there way through the DARK cave , cause bats use "eco" to find there way around the cave and without excellent hearing they wouldn't be able to hear there eco and without hearing there eco they bat will not find it's way around
Hope this helps !!! :D