<span>human beings in general; humankind.</span>
Collected amount; the sentence is saying that dance costumes from over the years eventually busted out from her closet.
<span>We stretched and then slowly jogged once around the track</span>
The verb is is because it "is" the plant.
All Alice eats are apples. Alice watches Anime. Her boyfriend, Ash, hates apples. He also hates anime. Alice and Ash are from an anime.
Hope this helps! :)