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68. The total number of orifices for outgoing and incoming of urine through the bladder is ____.

67. Which of the following contraception methods has the highest risk of accidental pregnancy?

32. Increasing the temperature of the human scrotum by 2°C (i.e., near the normal body core temperature) and holding it there would ____.

52.  Osmoregulators carry out excretion of salt through ____.

75. Which substance cannot pass through the semipermeable walls of the glomerulus?

Matching #3: Match each term with its definition. Each is only used ONCE.

69. As the male urethra leaves the urinary bladder, it is surrounded by the ____.

57. This type of immunity is present only when a newborn infant is fed by nursing and ends when nursing ends.

19. The most important function of sweat is to remove excess ____ from the body.

Natural selection is best described by which one of the following statements?