Which of the following describes a reason for making a prediction when
doing a controlled experiment?
O
A. To indicate what specific results will support a hypothesis
O
B. To understand the nature of an experimental subject
O
C. To identify a useful and reliable source of scientific information
O
D. To provide a context for why a specific question was asked

that is wrong, its not thymus.

these muscles maintain the blood pressure in the vessels. the smooth muscles are innervated by nerves of the autonomic nervous system. when the muscles contract, they cause vasoconstriction of the vessels and increase blood pressure. when the muscles relax, they enable vasodilation of the   blood vessels hence reduce blood pressure.