Some stomach cells transport chloride ions inside and bicarbonate ions outside the cell via a same transport protein. Such a transport mechanism is called a/an quzilet.

Such transport mechanism is called Antiport.

Explanation:

The production of hydrochloric acid (HCl) by the parietal cells requires the activity of the enzyme, carbonic anhydrase.In the presence of carbonic anhydrase  CO₂ and H₂O are converted  to HCO⁻   and H⁻.

The newly generated proton  (H+ )s transported into the lumen of the  stomach via the e H ₊₋K +ATPase (called the proton pump)Concurrently, HCO₃ ⁻  exits from the  basal surface (blood side) of the parietal cell via the HCO₃⁻   ₋ Cl antiporter.

The chloride ionneeded to form HCl, enters the parietal cell from the blood via the  HCO₃⁻₋Cl⁻ antiporter and exits at the luminal side by the Cl⁻ channel. Once within the lumen of the  stomach, cl⁻ combines with H⁺to form HCl.

The luminal K⁺ that is needed to maintain the activity of the proton pump(H⁺₋K⁻ATPase)enters the parietal cells from the stomach lumen by the H⁺₋K⁺ + ATPase and is then recycled back  into the lumen of the stomach by the K⁺ channel.

explanation:

b,bacteria convert nitrates

into nitrogen gas.

d,plants and animals take in

and use nitrogen compounds.

e,bacteria break down waste    

products and return nitrogen  

to the soil.

a,bacteria convert atmospheric

nitrogen to ammonia.

c,bacteria convert ammonia

to nitrites and nitrates.