In the given pentapeptide, find out an essential amino acid (\(Y\)) and the sequence present in the pentapeptide. 
Choose the correct answer from the options given below:
Given below are two statements for the following reaction sequence: 
Match List-I with List-II. 
Rearrange the following parts to form a meaningful and grammatically correct sentence:
P. a healthy diet and regular exercise
Q. are important habits
R. that help maintain good physical and mental health
S. especially in today's busy world