6
B
14
C
22
E
7
D
15
B
23
A
8
A
16
E
24
B
18. Respiratory system
1
D
7
B
13
A
19
A
2
B
8
E
14
A
20
E
3
E
9
C
15
E
21
E
4
C
10
B
16
E
22
E
5
A
11
A
17
D
6
D
12
E
18
D
19. Integumentary system
1
D
6
A
11
E
16
A
2
C
7
D
12
E
17
B
3
B
8
A
13
A
18
A
4
E
9
B
14
E
19
B
5
C
10
C
15
E
20
E
20. Urinary system
1
C
7
B
13
E
19
A
2
B
8
D
14
E
20
A
3
E
9
E
15
E
21
A
4
D
10
D
16
A
22
E
5
A
11
C
17
C
23
E
6
C
12
A
18
E
21. Male reproductive system
1
C
8
D
15
E
22
E
2
B
9
A
16
E
23
E
3
E
10
D
17
B
24
A
4
A
11
D
18
D
25
E
5
D
12
B
19
B
26
A
6
C
13
A
20
C
7
E
14
C
21
E
22. Female reproductive system
– I
1
E
7
C
13
A
19
E
2
C
8
D
14
A
20
A
3
B
9
B
15
E
21
E
4
E
10
E
16
B
5
D
11
A
17
E
6
A
12
E
18
E
23. Female reproductive system
– II
1
B
7
E
13
A
19
A
2
D
8
A
14
B
20
B
3
E
9
B
15
E
21
E
4
C
10
C
16
B
22
E
5
A
11
E
17
E
23
C
6
E
12
E
18
E