Question

solve this, ...if u r brilliant..�� its a 6 letter word 1. first 3 letter
indicate biggest thing in world. 2. 2, 3, 4 letter indicate parts of human
body. 3. 3, 4, 5 letter indicate part of circle.. 4. the whole word is the
key of internet now. ��101% brain work only one chance.... ��⚪ lets see who
will find the answer.....����

Answer 1

Search is the word as the biggest thing in world is sea and a part of body is ear and part of circle is arc and it is related to Internet.

Answer 2

The solution is SEARCH
(I) THE BIGGEST THING IN THE WORLD :- SEA 
(II) THE PART OF HUMAN BODY :- EAR
(III) THE PART OF CIRCLE :- ARC
(IV) AND... THE WHOLE WORD IS :-  SEARCH