Each star in the sky has reason! ALL in The Universe has purpose, yours?
The body is one! Each and every part serves a purpose. https://www.livescience.com/37009-human-body.html
For we were all baptized by one Spirit into one body–whether Jews or Greeks, slave or free–and we were all given the one Spirit to drink. Now the body is not made up of one part but of many.
So in Christ we, though many, form one body, and each member belongs to all the others.
Read Romans 12:5-10: https://www.bible.com/bible/111/ROM.12.5.NIV
And you, are?
And, we pray:
Let me not envy the spiritual gift of another member of your Body, Lord. How comical and foolish for the foot to envy the hand, the eye or the nose! How foolish for one part of the body to say it has no need of another part! I thank You, LORD, that You gave the Church the gifts it needs to grow and live for You, and I thank You for the spiritual gifts of others that I have benefited from, Amen.