It rained a lot in your suburban neighborhood last night. Today you notice that there is a large quantity of water flowing down the sides of the paved street into the water grates (example of a grate below). 

a) Where does this water go once it enters the grate?

b) How does this affect water systems?

c) How does this affect food systems?

d) A nearby construction site accidentally dumps a large oil drum into the streets and down the grates. What impact does the oil have on water systems? 

e) A nearby construction site accidentally dumps a large oil drum into the streets and down the grates. What impact does the oil have on food systems?