How has air pollution contributed to the decline in caribou populations?

The air pollution makes the caribou unhealthy, and this makes them more vulnerable to predators and diseases.

Specifically, the food the caribou digest (for example lichens) absorb the pollution dispoportionally, which means that the caribou ingest many unhealthy particles. 

The electoral college consists of 538 electors. a majority of 270 electoral votes is required to elect  the president. your state's entitled allotment of electors equals the number of members in its congressional delegation: one for each member in the house of representatives plus two for yoursenators.congress does the electoral college represent