Answer:
Marking mortal privation when firmly in place. An enduring summation inscribed in my face.
I am an object which is used in baseball during the day I can't be seen at all
I am needed for most animals and hardcover books. What am I?
I am in the past never in the future. I don't exist but have existed. I saw what you saw and that is what I will ever see.
Forward I am heavy backward I am not. What am I?
I go in hard, come out soft. Blow me hard and I'll make a pop. What am I?
What am I?
Animal
Difficult
Easy
Food
Funny
Kids
Logic