Wind is caused by which of the following? a. the gravity of the sun b. the moon's attraction to earth c. the uneven heating of earth's surface d. the changes in the ozone layer

C. The uneven heated of Earth's different surfaces. For e.g., land changes temperatures quicker as compared to the sea.

When the sun comes up, the land heats up quicker than the sea. As a result, air above the land will also heat up more than air above the sea. As hotter air rises from the land, the cooler air travels to the space which the hotter air rose from. This creates wind, or a cycle of air currents.

Hope this helps! :)

P.S. By the way, this seems to be more so of Geography as compared to Biology. :) No worries though!