When do most children understand that death is inevitable?

Phoenix, a research assistant, is going to "draw names out of a hat" to select research participants for his study. Phoenix would be

a. choosing a random sample. b. circumventing the proper protocol. c. stratifying the sample. d. doing a qualitative research study.

If subjects are awakened every time they enter REM sleep, then:

a. They will eventually compensate by increasing the amount of REM sleep b. They will eventually stop going into REM cycles c. Most subjects will waken d. They will be unable to get back to sleep