if i intend to achieve my goal, becoming an astronomy researcher, i must take a course load that includes high-level math and science classes. identify the nonessential appositive phrase and the noun it renames or identifies. my goal; i becoming an astronomy researcher; goal math and science; classes a course load; researcher
The correct answer is becoming an astronomy researcher
For starters, it is the only appositive phrase. It is also non-essential because the sentence conveys full meaning even if it was removed.