What air pollutants causes a reddish-brown haze in the sky?

Which would be an adaptation in a rainforest, but not in a tundra? a. ability to store water for a long time b. fur that blends in with snow c. strong claws for killing prey d. a beak that can dig into thick trees

Biology 1c cumulative exam i need awsners

What noticeable trend from this graph might be used to make a conclusion?