Final answer:
The coordinating conjunction in the sentence 'Mary likes to swim and to listen to music.' is 'and', which connects the two activities 'swimming' and 'listening to music'.
Step-by-step explanation:
In the sentence, "Mary likes to swim and to listen to music.", the coordinating conjunction used is "and". The coordinating conjunction in the sentence 'Mary likes to swim and to listen to music.' is 'and', which connects the two activities 'swimming' and 'listening to music'.
This conjunction connects two activities that Mary enjoys: swimming and listening to music. In this context, "and" is used to link two gerunds, "swimming" and "listening", which function as the objects of the verb "likes". It's important to note that coordinating conjunctions can connect words, phrases, or independent clauses in a sentence. The acronym FANBOYS is often used to remember the seven coordinating conjunctions: for, and, nor, but, or, yet, and so.