Breathing is when a gill converts from oxygen in water into oxygen in blood, and hemoglobin transports oxygen in blood. Given these facts, breathing is when a gill converts from oxygen in water into among the following options:
- tiny polyps
 - Hemoglobin
 - salmon
 - motility
 - unidirectional
 - exoskeleton
 - heat energy
 - epidermal


 

  Hemoglobin       