What property makes the normal pacemaker region of the heart function as a pacemaker?

Which are fat-soluble vitamins? a. abcd b. abek c. abdk d. acdk e. adek

This is a negative reaction to food that doesn’t involve the immune system

Which statement is false? a. an extinction burst is the complete cessation of the target behavior after the extinction procedure has started. b. extinction procedures should not be used with behaviors that cause serious injury to the subject. c. if the behavior analyst does not have the ability to control the subject's access to reinforcement, an extinction procedure should not be implemented. d. spontaneous recovery of the target behavior will be short-lived, as long as the extinction procedure remains in effect