Can someone help with this question please ?

Un poema de un escritor americano que tenga 4 versos y 3 estrofas

Does anyone know what my spanish teacher means by this? i need to use plural forms of the verb ser. and she asked me to use a couple of adjectives to describe the boys collectively and then the girls collectively?

Como es posible que en la misma latitud cerca de la linea ecuatorial haya picos cubiertos de nieve y selvas tropicales