Answer:
One by one we fall from heaven down into the depths of past, And our world is ever upturned so that yet some time we’ll last.
Sometimes black, sometimes white, I have veins but no blood
Feed me and I live, give me drink and I die.
This is needed both for courage and hardcover books.
Long and slinky like a trout, never sings till it's guts come out.
It rows quickly with four oars but never comes out from under his own roof. What is it?
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?