Answer:
I am an object which is used in baseball. During the day I can't be seen at all. What am I?
What is the word that even in plain sight remains hidden?
Travel a mile and I will change, travel a million and I will end as I started. What am I?
I go in hard, come out soft. Blow me hard and I'll make a pop. What am I?
I am a protector. I sit on a bridge. One person can see right through me, while others wonder what I hide. What am I?
A little house full of meat, no door to go in and eat.