Of those listed which gas is the least abundant in earths atmospherea- oxygen  b- nitrogen  c- ozoned - argon 

Option C = Ozone

Explanation:

The Percentage of given gases in atmosphere:

Oxygen = O₂ = 20.95 %

Nitrogen = N₂ = 78.08%

Argon = Ar = 0.93%

Ozone = O₃ = 0.000004%

Nitrogen is most abundant gas in atmosphere while oxygen is second most abundant gas. The nitrogen and oxygen are present in diatomic form such as O₂ and N₂.

Water vapors are also present but the percentage vary according to location. In hot humid areas the percentage of water is 0- 4% and it is third abundant gas.

The percentage of other gases in atmosphere are given below:

CO₂ = 0.0360%

Ne = 0.0018%

He = 0.0005%

CH₄ = 0.00017 %

N₂O = 0.0003%

H₂ = 0.00005%

there are mainly three domains in biological classification namely; archaea, bacteria, and eukarya.

archaea includes all the prokaryotic cells which are characterized by their lipid membranes. they have branched hydrocarbon which is attached to glycerol through an ether linkage.

bacteria includes all the prokaryotic cells, the cell membrane of which are made up of the unbranched fatty acid chain. in addition, they are attached to glycerol through an ester bond.

eukarya includes all the eukaryotic cells, that is, the cells contain a nucleus and other membrane-bound cell organelles.

they can be autotrophic as well as heterotrophic, unicellular as well as multicellular

they include kingdoms like protista, plantae, animalia, fungi et cetera.

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explanation:

blue stars have the highest surface temp

stellar distances are usually expressed in light-years

the measure of a star's brightness is called magnitude

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