Answer: Esophagus
Explanation: The Esophagus is part of the Digestive system and the rest are a part of the Respiratory system.
Bony matrix is solidly filled with organic ground substance and inorganic salts, leaving only tiny spaces (lacunae) that contain the osteocytes, or bone<span> cells</span>
<span>The trait is only an adaptation if it gives the squirrels an advantage in their habitat.</span>
Social norm deviance. They are making him do something that isn't socially acceptable. The others don't really make sense in this context anyways. Hope I helped :)
