In 1972 and 2002, canada and the u. s. agreed to take action regarding what kind of pollution?

The controlled use of fire by hominids: (a) limited the expansion of hominids into certain environments, such as dry grasslands. (b) decreased the amount of food energy available in the hominid diet. (c) contributed to geographical expansion and food production techniques in positive ways. (d) has been shown to contribute little to the digestive process of hominids.

People of french origin make up about of the canadian population. 23 percent 50 percent 1 percent 76 percent

Idont know any of these can anyone me