no no
No but someone could be allergic to sand.
you can be allergic to just about anything
It is possible for someone allergic to horses to also be allergic to camels. The allergy is most likely to the dander, and horses and camels can have similar dander.
yes, like tuna or salmon
Yes, if they are allergic to an ingredient inside them.
Yes! My mother is allergic to both.
no
yes
yes i am deathly allergic to them. i swell so big.
Well i believe yes because Shrimp are shellfish and Salmon are fish.
No, "allergic" is not an adverb. It is an adjective that describes someone who has an allergic reaction to something like pollen or certain foods.