Explanation: A subordinating conjunction is a word or words that join a subordinate or dependent clause (a phrase that doesn't have complete meaning on its own) with an independent clause (a sentence that has at least a subject, a verb and complements that give it complete meaning). In the given sentence we have an independent clause "the pep band started to play one of its familiar, energizing songs" and a subordinate clause "As my cheerleading squad and I began to stretch" joined by the subordinating conjunction "as."
The progression from wayfarers to spacefarers demonstrate that people have advanced to the point where not only do we travel on foot but Astronauts and Cosmonauts are able to travel in space. This shows how technology has improved.
