Environmental science guys answer​

13 c 15 a. I solve the two problem

13.Apart from PM 2.5 and PM 10 which are known to be the most harmful air pollutants, there is sulphur dioxide, nitrous oxide, carbon monoxide and other chemical gases which can equally cause irritation in the eyes . "It is called chemical conjunctivitis.

the factors that the economies of the muslim empires prosper were:

1- land trade routes-located between three continents  

2- sea trade routes

trade contributed to the spread of muslim empires, and with that islamic culture led to a growing feeling of internationalism resulted in the transfer of technology, science, and other cultural forms.