English Respiratory system Cited by user Cruithne9 on 07 Aug 2017 In most fish, and a number of other aquatic animals (both vertebrates and invertebrates) the respiratory system consists of gills, which are either partially or…
English Bird anatomy Cited by user Cruithne9 on 23 Jul 2017 Bird anatomy, or the physiological structure of birds' bodies, shows many unique adaptations, mostly aiding flight.