Weight in my belly trees on my back riddle

Question: Weight in my stomach,trees on my back,nails in my ribs,it's feet I lack.What am I?

Question: Why did the hen cross the road?

Question: What do you call a sad bird?

Question: What is an astronaut's favorite key on the keyboard?

Question: What is the tallest building in the world?

Question: What tastes better than it smells?