(10 points) Marine Biology figure out what goes in the blank

A number of compounds in the atmosphere have the effect of warming the Earth's surface.
Scientists have found that recent increases in the abundance of the compound (*Blank*)
in the atmosphere have been the most important factor in causing recent global warming trends.

Water vapor. The most abundant greenhouse gas, but importantly, it acts as a feedback to the climate. Water vapor increases as the Earth's atmosphere warms, but so does the possibility of clouds and precipitation, making these some of the most important feedback mechanisms to the greenhouse effect.

Explanation:

organ system-an organ system is a group of organs that work together to perform one or more functions. each does a particular job in the body, and is made up of certain tissues.