Title Work Title No: 19704 Medium: Multimedia; Moving Image Date: 1963 (Release) Original Summary: Part of the "Biology program, unit 1: Ecology" series, the film "'[d]efines and illustrates the factors that determine how plants and animals are distributed throughout the world. Uses detailed distribution maps to explain how the dispersal of any species of plant or animal is limited by its rate of increase, its ability to disperse, and its ability to surmount physical and biological barriers."--Summary from WorldCat Duration: 16 min Genres: Educational
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