rapunzel公主:how many kinds of poputions are there?

how many kinds of poputions are there? how many kinds of pollution are there? Trees are of many kinds. How many kinds of teaching methods are there in English teaching?What are they? There are many kinds of a ____in the big zoo. How many kind of animals in africa? how many countries are in the area of middle east How many people have died of AIDS would wide? How many of football competitions do you know? How many kilograms of bamboo do pandas eat everyday?