Insect resistant cotton plants have been genetically engineered by inserting a gene from a/an

1. The question concerns genetically engineered cotton plants that are resistant to certain insects. 2. This refers to Bt cotton, which incorporates a gene that allows the plant to produce an insecticidal protein. 3. The source of this gene (typically a Cry gene) is a naturally occurring soil bacterium known as Bacillus thuringiensis (Bt). 4. Therefore, the gene making cotton plants insect resistant in this context is inserted from a bacterium (B).