My opinion is, they should explain the term they used when writing. This is because the reader needs to under the abbreviation.
A variable is something that can change like the temperature. A constant is something that will always stay the same like where the temperature is being measured. These terms are used a lot in science. Also, variables are used in math often. Hope that helped
A for the first and one and A for the second also
A prepositional phrase is a group of words consisting of a preposition, its object, and any words that modify the object. Most of the time, a prepositional phrase modifies a verb or a noun. These two kinds of prepositional phrases are called adverbial phrases and adjectival phrases, respectively.
prepositional phrase- plants
preposition- in
if you have visions, you have to have 2 of them so the second pair would be
prepositional phrase - daily basis
preposition- on
Learn more about prepositional phrase here:
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