Blank is the most abundant gas in earths atmosphere

The answer to your question is nitrogen :)
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Hey there!

There are many gases in the atmosphere - like greenhouse gases such as methane and carbon dioxide that lead to climate change, and water vapor and oxygen that help us. However, there's only one element that remains abundant throughout the entirety of the atmosphere, and that element is nitrogen. Nitrogen takes up nearly 78% of the atmosphere and leads in the composition of the atmosphere over an astounding 21% oxygen.

Hope this helps!

Answerd. may include all of these are many definitions of bases: the  brønsted-lowry definition of acids and bases says that bases are proton acceptors.the arrhenius definition of acids and bases says that bases increase [oh⁻] in solution (thereby producing oh⁻ ions)the lewis definition of acids and bases says that bases donate electron pairs.therefore, the sensible answer is that a base may include all of the described characteristics.