Which statement about Canada's national parks is accurate? 

A)  National parks occupy only 30% of Canada's land mass. 
B)  Canada has 23 national parks. 
C)  Canada's national parks are managed according to a preservationist ethic. 
D)  Resource extraction is permitted in Canada's national parks.

What does the space occupied by an atom mostly consist of? 

A)  protons 
B)  nothing 
C)  neutrons 
D)  electrons