Which of the following neurotransmitter reductions plays a role in Parkinson's disease?

The term blanching, used to describe localized cold injury, means the tissue has turned to which of the following colors?

A) White or lighter B) Black C) Blue or purple D) Red

What characteristic is associated with modern lightweight construction techniques?

a. Greater susceptibility to collapse b. Unstopped stud bays c. Higher dead load d. A more air-tight structure