Answer:
I am heavy forward, but backward I'm not. What am I?
I am an insect and the first part of my name is the name of another insect. What am I?
I am always running but I never get tired or hot. What am I?
I am a time for gathering crops. Remove the first three letters and I become an object you can wear.
I am known for my natural tuxedo and marching. What am I?
No matter how little or how much you use me, you change me every month.