Answer:
Its title means book.
My first is twice in apple but not once in tart. My second is in liver but not in heart. My third is in giant and also in ghost. Whole I’m best when I am roast.
What is seen in the middle of March and April that can’t be seen at the beginning or end of either month?
The more of it there is, the less you see.
I climb higher when hot, But beware my rage, I’ll kill with a breath, If I can escape my cage
You use it between your head and your toes, the more it works the thinner it grows.
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?