Final answer:
Canadians wear red poppies on Remembrance Day to honor fallen soldiers, a tradition stemming from the poppies which grew on WWI battlefields.
Step-by-step explanation:
On Remembrance Day, Canadians traditionally wear red poppies to honor the fallen soldiers and the sacrifices made during wars. This tradition is rooted in the history of the Great War (World War I), where poppies were the first flowers to grow on the graves of soldiers in Flanders's battlefields.
The flower symbolizes remembrance and respect for those who served and died. It is common for Canadians to pin these poppies on the left side, close to the heart, leading up to and on Remembrance Day, on November 11th.