Answer: make systematic observations and carefully collect relevant evidence.Then they use logical reasoning and some imagination to develop hypotheses and explanations.
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Explanation:
The correct answer is: D. damage to nerves that control the stomach.
The vagus nerve is a cranial nerve that controls stomach contractions and thus, the movement of the food. When the vagus nerve is damaged, the muscles of the stomach do not function properly, so gastroparesis occur. Consequently, food then moves slowly or even totally stops moving through the digestive tract.
Operons are the functional units of transcription and genetic regulation. These are found in bacteria and their viruses where genes coding for functionally related proteins are grouped along the DNA.
The two types of operons are- inducible and repressible.
They regulate the genes as in negative inducible operons, a regulatory repressor protein is bound to the operator. It prevents the transcription of the genes on the operon. If positive inducer is present, it binds to the repressor and changes its conformation so it is unable to bind to the operator.
