- Date:
- 1962
- Main contributors:
- Encyclopaedia Britannica Films, Ralph Buchsbaum, John Walker, William Kay, William Peltz
- Summary:
- Shows through animation, microcinematrography, and time-lapse photography the basic differences between single-celled organisms and the colony of several cell types that compose the body of the sponge. Explains the need for and advantages of the multicell-type of life through a demonstration of surface area to volume relationships. Animates the functioning of the cells within the sponge and uses live-action photography to illustrate sexual and asexual reproductive methods. Concludes that the 5,000 species are grouped according to their skeletons. | . Models, animated drawings, laboratory demonstrations, and photomicrography are combined to illustrate the structure, the reproductive processes, the motility, and the adaptation of sponges.