You are presented with the quiz "The looseness of soil has a positive impact on what plant part and growth in that soil." 

But you don't know the answer, so you turn to your teacher to ask for hints. He says that "the looseness of soil has a positive impact on a plant 's roots' growth in that soil" and "roots are the veins and arteries of the plant". 

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


 

    Veins and arteries.       