Yes it occurs naturally on everyone :)
I do believe it's a recessive trait. I hope that helps
One very specific way that humans caused changes in the atmospheric CO2 levels is the fossil fuels that the humans are burning is causing an increase in the CO2 levels. Other ways humans are doing this is by driving cars, deforestation, and an increased industrialization that releases CO2 into the atmosphere.
Karyotype helps to study the presence and location of genes on chromosome. This also helps to find the mutations such as duplication or deletions.
China. Their country has been rapidly growing for years.
Have a nice day!