1: Bio class setting

4: Stable mate

8: Circle sections

12: Whip mark

13: Cattle poker

14: Carbonated drinks

16: In the near future

17: Rum drink

18: Steep in wine

19: Smooths, in a way

21: Barely manages, with 'out'

23: City near Scottsdale

24: Corkscrew-tailed animal

25: Glasgow girl

27: Emolument

29: It can be a sacrifice

30: Tree fluid

31: Band blaster

34: Caught in the act

37: Fibula or femur

38: Deep distress

39: Freshly

40: Japanese honorific

41: Withered

42: 'No dice!'

43: Microbrewery offerings

45: Balanced states

47: Pig's digs

48: Ring toss item?

49: Hammered obliquely

50: Verbalize

51: Adorable

52: Zoological duct

55: Young horse

58: Train for a title fight

60: Gaze fixedly

62: Reed instruments

64: 'Them' insects

66: Burn soother

67: Japanese-American group

68: Fly alone

69: Smooch

70: Little gull

71: Leak slowly

72: Attend

1: Island near Molokai

2: Together (with)

3: Be flexible

4: EPA computation

5: Scene from 'Cops,' e.g.

6: Swindles

7: Upper hand

8: Rm. coolers

9: Spacious

10: Puzzle piece

11: Back talk

12: Winged stinger

15: Red or Yellow

20: Turn on an axis

22: Stretch across

26: 'Not only that ...'

28: Musclebound brute

29: Incidentally, in Netspeak

30: George W. Bush, to George H.W. Bush

31: Knocks for a loop

32: 'Don't stop'

33: They're 16th of 26

34: Outlaws

35: Single thing

36: Seductive

37: ___-relief

40: Go down

41: In mourning

43: 'Caught you!'

44: Potato chip maker

45: Barfly

46: Golf ball pegs

49: Terrarium pet

50: Operate the rudder

51: Craft entered gingerly

52: Worth

53: Responded to reveille

54: Goes out with

55: Debate side

56: Article that may list survivors

57: Give the slip to

59: Quarterback's call

61: Filing aids

63: Confession topic

65: Absorb, with 'up'