The right lung has two lobes, and the left lung has three lobes

Which is true about the process of fractional distillation of liquid air?

a. Compressed air is a by-product. b. It produces pure liquid oxygen. c. Liquid nitrous oxide is produced. d. Concentrators use it to produce oxygen.

Catecholamines and noncatecholamines are:

A) adrenergic agonists B) adrenergic antagonists C) sympatholytics D) muscarinics