During swallowing,
a) the tongue flattens to the bottom of the mouth.
b) smooth muscle in the esophagus contracts slightly.
c) salivary secretions stop. the hard palate rises to close the nasal passages.
d) the epiglottis bends to close the trachea.

the answer is b it comes down to b and c for me

desert perennials often survive by remaining dormant during dry periods of the year, then springing to life when water becomes available. most annual desert plants germinate only after heavy seasonal rain, then complete their reproductive cycle very quickly.