An example of communication between cells of human body systems is the "fight, flight or freeze" response. The physiological responses enable
the body to deal with extraordinary situations. Use the chart on the left
to determine which two systems would work together in a night
response such as almost jumping out of the way of a car. What two systems are being used?

d. groundwater flows through the subsoil and deposits minerals.

the answer is 100% density i've answered this question before and done the quiz myself.

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.  

you're crazy : )