The stratosphere
is the lowest level of the atmosphere
is responsible for Earth's weather
transmits radio signals around the Earth
is used by commercial airplanes

is used by commercial airplanes

Explanation:

The stratosphere is used by most commercial airplanes. This is because this layer of earth is stratified and more stable.

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:

ok yes, but what is the question? as soon as you ask the actual question i will answer it. : )