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Solve the following word puzzle

Across
Structure that expand lung cavity in mammals
Part of the forebrain highly reduced in birds
Primitive swim bladder with open connection to digestive tube
Organ highly developed in reptiles for chemical perception
Predecessor of ventricle
Down
Part of the brain that process smell and homeostasis
Predecessor of atrium
Predecessor of mouth
Structure that allows water conservation in Mammals
Gland that releases glucocorticoids in stressful situations