Usted ______________________ a Chile todos los veranos, ¿verdad? (Esperar/ Viajar)

Mis amigos y yo ___________________ ____ la universidad. (Aprender a/ Asistir a)

PCV stands for 

Proteins are formed by ______ different amino acids.

Metabolism is the sum of

When two atoms are held together because their valence electrons are attracted by opposite charges, they are united by

Tú ______________________ una bicicleta, ¿verdad?  

Mis abuelos paternos no ___________ de este país.

Mujer de Guatemala

If bacteria were to invade the Central Nervous System, microglia cells would migrate to the area to engulf and destroy them.