The animal kingdom ( motion picture) - Nichols, D.; Trueman, E. R.; Varley, M. E.; Open University (Milton Keynes : Open University, 1972)
Illustrate the theme of the unit text - that many animals move by means of'fluid muscle systems' and'hydroskeletons'. Three internal cavities that can act as hydroskeletons are shown : enteron (in cnidrarian anemones), haemcroel (in bivalve molluscs); coelom (in echinoderm starfish)
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Keywords: Animal locomotion; Animal mechanics