Answer:
only helium makes balloons go up so the answer is helium
Explanation:
Salutations!
What component of Earth’s atmosphere exists entirely as a result of photosynthesis?
Oxygen is the component of Earth's atmosphere that is existed entirely as a result of photosynthesis. Photosynthesis is a procedure that plants and other different organisms use sunlight to make their food. It is a chemical procedure.
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Sea Floor Magnetism, Fossil Evidence, <span>Distribution of volcanoes and earthquakes on the globe </span>and Continental drift.
Gene (DNA) expression would be B
