TY  - BOOK
AU  - Nichols,D.
AU  - Trueman,E.R.
AU  - Varley,M.E.
ED  - Open University
TI  - The animal kingdom ( motion picture)
PY  - 1972///
CY  - Milton Keynes
PB  - Open University
KW  - Animal locomotion
KW  - Animal mechanics
N1  - 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)
ER  -