You are presented with the quiz "Changes in the pH of soil can cause plants to decay and leave what for future plants?" 

But you don't know the answer, so you turn to your teacher to ask for hints. He says that "changes in the pH of soil can cause plants to die" and "when plants die, they decay and leave minerals in the soil for future plant life". 

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


 

    minerals       