I’m confused can an expert help

The two prepositional phrases in the attached picture are "at age twelve" and "in his father's dental practice," containing the prepositions "at" and "in".What is a prepositional phrase?A prepositional phrase is a phrase that consists of a preposition followed by a complement or object. Prepositions are those words we use to connect other words, phrases or sentences, creating relationships between them. Prepositions can indicate time, place, movement, among other things. Examples of prepositions are:AtInOnDuringByDownTowardThroughWithWithoutUpFor example, in the sentence "I can't talk to her. She is at school," the prepositional phrase is "at school." It contains the preposition "at" and its complement, "school." In this particular case, "at" is used to indicate place.Therefore, we can easily identify the prepositional phrases in the attached photo as the ones containing the prepositions "at" and "in", as answered above.Learn more about prepositional phrases here:https://brainly.com/question/24930951#SPJ1