You are presented with the quiz "What is transported by sticking to the fur of an animal?" 

But you don't know the answer, so you turn to your teacher to ask for hints. He says that "if seeds stick to the fur of an animal then that seed will be transported by the animal" and "burrs and some other seeds have tiny barbs that hook on to cat fur". 

So, what's the best answer to the question?


 

 burrs          