What are 3 good freshwater bioindicators?

20 points and brainlist 1. london has suffered from terrible air pollution for at least seven centuries. why is the city so prone to its famous “london fog? ” what did london do to get rid of its air pollution? 2. why does air pollution cause problems in developing nations more than in developed ones?

Can someone give me the answers to this?

How do primates acquire food? a. through a limited set of highly specialized foraging strategies b. through the use of highly developed material culture c. through cooperation among kin groups, mostly by hunting d. through a wide variety of food-foraging strategies