oHoHHow many stages of sleep are there in human beings?

_____ occurs when a person sees only the original use of an object, which can ultimately interfere with problem solving

a) Functional fixedness b) A customary viewpoint c) Cross-modal perception d) Divergent thinking

In humans, the __________ signals the onset of ovulation within 12 to 24 hours

a. change in the cervical mucus to white and sticky b. LH surge c. onset of bleeding d. sudden increase in sexual interest