Atmosphere is the air that we see around us. It consists of various gases. They are oxygen, nitrogen, carbon-di-oxide, neon, etc.
The biosphere is the narrow zone of contact between land, water and air. It is in this zone that life, that is unique to Earth, exists. All the living organisms are linked to each other and to the biosphere for survival.
HOPE HELPED U PLZ MARK IT BEST :)