Question

Solve this, ...if u r brilliant..Solve this, ...if u r brilliant..Its a 6 letter word1. 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 workOnly one chance.... ⚪Lets see who will find the answer.....

Answer 1

ANSWER IS SEARCH.
Hope it helps and pls mark as the best answer. :-)

Answer 2

first 3 letters: SEA

2,3,4: EAR

3,4,5: ARC

Whole word: SEARCH