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

First 3 letters refer to the Biggest that's SEA.
Letter 2,3,4 indicates body part that's EAR.
Letter 3,4,5 indicates part of circle that's ARC
The whole word is the key of internet now.

That refers to SEARCH