Outdoor air pollution is a complex mixture of several pollutants, the common sources of outdoor pollution are emissions caused by combustion processes from motor vehicles, solid fuel burning and industry. 
They major classes of outdoor pollutants include;
Carbon monoxide; carbon dioxide, sulfur dioxide, nitrogen oxides, VOC's, SPM's, photochemical oxidants, ozone and PANs.
        
             
        
        
        
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Answer: 
Gas exchange
Explanation:
Gas exchange takes place in the millions of alveoli in the lungs and the capillaries that envelop them. As shown below, inhaled oxygen moves from the alveoli to the blood in the capillaries, and carbon dioxide moves from the blood in the capillaries to the air in the alveoli.
 
        
             
        
        
        
<span>.Chloroplasts and bacteria are Similar in size.</span>
        
             
        
        
        
Answer:
Dodos were flightless birds that have been extinct for about 300 years. Imagine that biologists found two surviving dodos and mated this pair of birds. What would you expect of the resulting dodo population after three generations?
The maximum number of alleles present for any gene in the new population is two
Explanation:
As a result of this mating, in the third generation the maximum number of alleles present for any gene in the new population will be two.