Pls help ill give a heart star and maybe the brainliest answer!!

In a scientific experiment, a is any factor that can be changed or be changed

Unlike other andean nations, chile has a relatively small population of mestizos people of european descent indians people of asian descent

Plz asap can someone find the answer or the mark scheme or anything plzzz you : ) ‘it's perfectly understandable that hundreds of millions of people around the world live close to volcanoes’ use evidence to support this statement. (6 marks)