Answer:
except option 2 all of them are applied
Explanation:
Secretion helps in moistening the food, making it easier to swallow and preventing oral infections.
Answer:
Nitrification.
Explanation:
It is a part of the Nitrogen Cycle. The bacterias can convert ammonia into nitrite and nitrate, these compounds are fundamentally important for all life. They are used for the creation of proteins and amino acids.
I hope this answer helps you.
