Certain gases have to be present in the atmosphere in a fairly consistent _____.

system
process
season
method
proportion

proportion

The earth is extremely _____.

pure
complex
simple
clean
organic

complex

Certain gases have to be present in the atmosphere in a fairly consistent proportion.

To determine the answer to this question, you can use your knowledge of the composition of Earth's atmosphere. Earth's atmosphere is made up of several gases, including nitrogen (N2), oxygen (O2), carbon dioxide (CO2), and small amounts of other gases. The proportion or concentration of these gases remains relatively constant over time.

To obtain more specific information about the proportions of gases in the atmosphere, you can refer to scientific data. Organizations like the National Oceanic and Atmospheric Administration (NOAA) and the World Meteorological Organization (WMO) regularly monitor and measure the composition of the atmosphere. They collect data from various sources, including weather stations, satellites, and research experiments.

By analyzing these measurements, scientists can determine the consistent proportion of gases in the atmosphere. For example, they have found that nitrogen occupies about 78% of the atmosphere, oxygen accounts for approximately 21%, and the remaining 1% consists of trace gases like carbon dioxide, argon, methane, and others.

So, to answer the question, certain gases have to be present in the atmosphere in a fairly consistent proportion.