Answer:
São Paulo is a city in Brazil that faced the worst drought in Brazil in the last 100 years between 2014–17. 
The reason of the drought was diminished rain falls from last three third consecutive year in the region. Humans were somewhere responsible for the drought and less rainfall because this was caused by expansion of deforestation into the Amazon basin. Deforestation disturbed the environmental cycle that caused less amount of rain in São Paulo, Brazil.
 
        
             
        
        
        
Answer:
(three) crossing over, mutations caused during crossing over, and independent assortment. 
Explanation:
Because of recombination and independent assortment in meiosis, each gamete contains a different set of DNA. This produces a unique combination of genes in the resulting zygote. Recombination or crossing over occurs during prophase I.