Why did some "beak" types survive on the new island ( with large seeds) when they could not survive on the original island?

I believe that the reason as to why some beak types survive on the new island when they could not survive on the original island is because they are adapted to grip larger seeds better than the smaller seeds. The characteristics of beaks that interfered with feeding success on the original island are the shape, size, type of edge, and ability to handle it. Adaptation help organisms to survive in their ecological niches, the adaptive traits may be structural, behavioral or physiological. 

If these are the missing choices: a. to determine skin temperature, place the back of your hand against the patient's skin.b. determine body temperature by touching the patient's hands and feet.c. skin temperature will tell you very little about this patient's condition or well-being.d. the patient's skin temperature and color will likely be warm and red.my answer is: a. to determine skin temperature, place the back of your hand against the patient's skin. using the back of the hand to check for temperature rather than the palm is more effective because the back of the hand has more nerves that can feel and transmit the temperature than the palm.

C- a hypothesis or d- an observation