The most abundant gas present in the air by volume would be A. Nitrogen, it composes about 80% of the air.
I believe the upper left box is the correct response because both the sun and moon's gravity are impacting the tides.
It is summer on the south part of earth.
I don’t know I’m just answering this so I can ask more questions.
This is a tough one, but I believe that it is B because more and more people want to enjoy the city life. Look at cities like Chicago, Beijing e.t.c, they are developing because more and more people are leaving rural areas and starting a new life in cities.
