Answer:
I can be as thin as a picture frame but my insides have many things you can see.
Nothing specific, but more than a few. This many clustered, together will do.
A section of the calendar dedicated to mother nature.
Built of metal or wood to divide. It will make us good neighbors, if you stay on your side. What is it?
What is in seasons, seconds, centuries, and minutes, but not in decades, years, or days?
When is it bad luck to see a black cat?
Easy
Animal
Difficult
Food
Funny
Kids
Logic
What am I?