Shows how the gradual changes in a pond affect living things from the end of winter to the beginning of summer. Includes extreme close-ups and photomicrography to show protozoa and other minute forms of life found in a pond.
2006
2016
2015
1996
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2012
2003
2007
2005
1997
2019
2014
1999
1953
2020
2023
1983