to demonstrate that oxygen is evolved during photosynthesis

7:04

3:27

15:07

15:07

26:51

29:51

26:51

26:51

17:35

26:40

5:02

2:15

6:02

1:08:29

1:14:35

3:36

7:01

1:20

5:47

3:02

18:31

1:28

1:11

کوتاه

3:50

4:25

10:13

5:02

2:18

کوتاه

5:35

2:21

4:38

5:02

کوتاه

1:24

1:48

20:12

4:05

1:40