Question

three centuries ago, issac newton wrote: \... to myself i seem to have been only like a boy playing on the seashore... whilst the great ocean of truth lay all undiscovered before me.\ when newton surveyed the vast ocean of truth which lay before him, the laws of nature were shrouded in an impenetrable veil
but the ocean that newton knew as a boy has largely disappeared. before us lies a new ocean, the ocean of endless scientific possibilities and applications, giving us the potential for the first time to manipulate and
identify a key term used in both passages.
ocean
complete
which clue best identifies \ocean\ as a key term in both passages?
the title or section heading
the first or last sentence
a repeated word or phrase
a signal word or phrase
done

Explanation:

In the first passage, "ocean" is used metaphorically as "the great ocean of truth". In the second passage, "ocean" is also used metaphorically as "the ocean of endless scientific possibilities and applications". The word "ocean" is repeated in both passages, which is a key indicator that it is a key term.

Answer:

C. a repeated word or phrase