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USA - 1982 - Microorganisms swim in a pond.
USA - 1988 - Scientific experiments show how osmosis can cause a decrease in a cell's water content.
1940s: Microscopic organisms are shown, in 1945.
USA - 1987 - Molecular biologists study DNA and learn how to alter it in simple organisms.
A doctor shows blast marks inside a hospital in Hiroshima, Japan, in 1946. (1940s)
CIRCA 1973 - A woman uses a microscope to observe antibodies fighting off germs.
CIRCA 1977 - Microorganisms are used to purify sewage in a conservation effort.

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3416855941
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USA - 1987 - Differences between bacteria and protozoans are shared.

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