Combining red and blue lights produces ______ light

At 3 o'clock in the morning John has already slept for 4 hours. As long as his sleep continues, we can expect an increasing occurrence of:

a. sleeptalking. b. slower, more regular breathing. c. muscle tension. d. genital arousal. e. Stage 4 sleep.

According to the __________ theory of biological aging, DNA in body cells is gradually damaged through spontaneous or externally caused mutations

A) genetic programming B) senescence C) random events D) cross-linkage