Rita finds her roommate, McKenzie, asleep on the couch when she gets home. She’s amused to see that McKenzie’s eyes seem to be moving around under her eyelids. She is in which stage of sleep?

Death rate best describes the number of people who die per one thousand individuals in a population per year.

In  microbiology, pure culture is a laboratory  culture  containing a single  species  of organism. it is usually derived from a mixed culture. pure culture transfers a small sample into new, sterile  growth medium  in order  to distribute the individual cells across the medium surface. it separates the individual cells. when the cells multiply, each will form a colony and it then may  be used to inoculate more medium.