Why Are Some Conservation Biologists Concerned That the Polar Bear

Why are some conservation biologists concerned that the polar bear will be extinct by 2050?

A) Over hunting will decrease the population
B) Taiga will become tundra, brining in brown bears as competitors
C) Increased snow will fall in the Arctic and the bears won't be able to hunt
D) The seal population will decrease, and the bears will starve
E) Arctic ice caps will melt and the bears won't be able to hunt