It is often necessary to compare two or more items in academic writing, especially in the sciences.
It is often necessary to compare two or more items in academic writing, especially in the sciences.
Why have they used plural "sciences" and the definite article "the" before it?
g. physics, chemistry, biology. It has the definite article because it is a known entity (the reader is assumed to already know which subjects these are).
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"the sciences" means the group of subjects considered to be scientific, e.g. physics, chemistry, biology. It has the definite article because it is a known entity (the reader is assumed to already know which subjects these are). It is kind of a set phrase; cf. "the arts".