The pronoun usually comes in at the beginning of the sentence
The surface of alveoli is thin and moist, alveoli has a very large surface area in total;plenty of room for gas exchange, and the surface of alveoli is covered with capillaries.
Answer:
please mention the chapter name ! so we can answer easily
Yo digo que es ‘es’ porque si fuera ‘sea’ tuviera que ser una pregunta.
