In the following passage, some words have been deleted. Read the passage carefully and select the most appropriate option to fill in each blank.
There are over 9000 species of birds on this planet (1) ________of which over 1360 are found in India alone. 81 species of birds (2)________endemic to India. Because birds are found everywhere, and in all (3)________zones, their sizes, shapes and wings are (4)________ according to the needs of their habitat. For instance, eagles and hawks have massive soaring wings with primary feather that (5)________out and allow them to soar high in the sky.
Select the most appropriate option to fill in blank number 1.