Vance has learned to voluntarily control the activation of his autonomic nervous system as part of the treatment for an anxiety disorder. this is an example of

In this case, the person had an anxiety disorder. The anxiety is in voluntary controlled by the autonomic nervous system in humans.

The biofeedback is a  mechanism, by which a person can control the working of involuntary system. This is done by the restriction of autonomic nervous system to specific stimuli.

In this case, the autonomic nervous system is trained to act according to the thoughts and the feelings.

Hence, the given situation is an example of Biofeedback.

question: which statement best describes the different properties of metals?

answer: they are shiny and bend without breaking.

since metals have certain characteristics properties, they include the following: they are ductile, malleable, shiny, hard, lustrous, flexible and they are good conductor of heat and electricity. so therefore, metals are not dull and they are not non-flexible as listed. instead, they are shiny and flexible.

hope this , have a good day. c;