Question

which of the following is a natural source of greenhouse gases? ocean - atmosphere exchange of water vapor; deforestation; manufacturing of cement; burning of fossil fuels

Explanation:

Natural sources of greenhouse gases occur without human intervention. Ocean-atmosphere water vapor exchange is a natural, cyclical process that releases water vapor (a greenhouse gas) into the atmosphere. The other options are human-caused (anthropogenic) sources: deforestation, cement manufacturing, and burning fossil fuels all result from human activity.

Answer:

Ocean-atmosphere exchange of water vapor