How did pasteur solve spallanzani’s problem of limiting exposure to air?

Pasteur was a scientist who was a pioneer of the process of pasteurization, in which we prevent liquids most importantly milk is heated to prevent spoiling due to bacteria.

Pasteur solved Spallanzani’s problem of limiting exposure to air by using a flask with bent neck which allowed air to pass but did not allow microorganisms which are present in the air to reach the broth.

B. Carbon dioxide concentration increases and causes global temperatures to rise

Explanation:

Carbon dioxide is a green house gas that has contributed to the rise in global temperature or global warming. Global warming occurs when carbon dioxide (CO2) and other air pollutants and greenhouse gases collect in the atmosphere and absorb sunlight and solar radiation that have bounced off the earth’s surface. Also Global warming is the long-term rise in the average temperature of the Earth

Other examples of green house gases are methane, nitrogen, ozone