Which best describes a plasmid I’ll give brainliest pls

Plasmids are used in biotechnology.  

Explanation:

A plasmid is a natural or artificially modified circular DNA molecule for use in biological research.

The researchers use the plasmids to insert a DNA fragment of interest, thanks to the cloning cassettes. They can clone genes to express proteins or RNAs and analyze them.

A plasmid is a small, extrachromosomal DNA molecule within a cell that is physically separated from chromosomal DNA and can replicate independently. They are most commonly found as small circular, double-stranded DNA molecules in bacteria; however, plasmids are sometimes present in archaea and eukaryotic organisms

Explanation:

trachea, alveoli, lung capillaries, arteries

i think that is new experiments yield untrustworthy data and should be carefully considered, because you don't know what will happen with the experiments.