Marconi’s invention was not only practical but also affordable. what is the complete correlative conjunction in the sentence?

- Not onlybut also.

Explanation:

Correlative conjunctions are the conjunctions that work in pairs where both are contributing to connect the words or phrases in the sentence and stabilize the meaning.  

As per the given question, the complete correlative conjunction would be 'not only...but also' as it is working in pairs to link or correlate the words and phrases to offer a balanced and cohesive thought. Thus, 'Not onlybut also' is the pair of correlative conjunction employed in the sentence.

answer; i believe that the correct answer is (scientific data);

- "when these words are put together to convey a meaning it is known as a sentence. a sentence is a group of words that makes complete sense. placing of words in a sentence is very important. the second sentence is a question."