Give reason:

Three small bones of ear ossicles are advantageous as compared to one single bone for hearing.

Give reason:

Blind spot is considered as 'area of no vision'.

Describe the mechanism of focusing the image of a distant object in your eye when you raise your head after reading a book.

By closing the eyes and gently pressing them with your palms, you may see some specs of brilliant light. How do you get this sensation while there is no light entering your eyes?