What substance is used in medicine to produce various images of organs and tissues?

The substance like iodine 131 is used as in medicine which can help produce various images of organs and tissues. This substance is called as a tracer. Iodine 131 is a radioactive isotope which is also used to monitor thyroid gland functioning, to locate tumours in the liver or brain, and also treat thyroid cancer.

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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