The New Encyclopaedia Britannica: Macropaedia : Knowledge in depth |
Contents
EXCRETION AND EXCRETORY SYSTEMS | 1 |
EXERCISE AND PHYSICAL CONDITIONING | 28 |
EXPLORATION | 33 |
Copyright | |
36 other sections not shown
Other editions - View all
Common terms and phrases
activities agriculture America animals areas become bladder blood body bone bottom breeding called cause cells century changes close common countries crops culture dances disease dorsal early effect eggs Europe example farm feed ferns fertilizer field Finland fishes folk freshwater function gametophyte gill growing growth head important increase individual Italy jaws kidney known land later leaves length less living lower major male marine marriage material methods metres mouth natural needed North occur ocean organs origin percent period plants practice present production rays reduced regions relatively remains renal result scales seed sharks side social societies soil sometimes space species spines structure surface teeth teleosts tion traditional tropical United upper urine usually varieties various vessels widely