factors affecting resistance

15:04

27:51

15:27

9:30

18:47

9:56

9:28

1:24

3:40

2:30

21:44

8:19

42:16

7:55

54:12

3:40

1:10:10

9:17

2:45

24:25

10:20

5:31

5:59

1:35

6:04

6:33

1:14:27

12:16

7:00

48:44

3:01:11

6:34

7:33

1:46

4:17

2:25

1:15

3:56

3:06

14:16