Answer:
A. Form of Government
Canada is a constitutional monarchy, with a parliamentary system. The head of the state is the queen of the Commonwealth Elizabeth II, while the head of government is the prime minister, who is elected indirectly by Canadian citizens.
B. Major Government Elected Positions
The Prime Minister of Canada is the country's head of goverment. He or she is the leader of the political party that obtains the most votes in the Canadian general elections. In Canada, citizens do not vote directly for the Prime Minister, they choose their parliamentary officials according to the geographical area where they live.
The party with the most elected parliamentary officials chooses the prime minister among its members.
C. Voting/Participation in Government
Any citizen in Canada is technically allowed to become part of the government, to join a political party, and so on, but becoming a member of parliament, or even more, the prime minister, is a difficult process that requires a lot of political influence, connections, and preparation.