What is the imperfect tense?
cuando paquita joven, le gustaba nadar.
iba
era
2. de niño, armando la tele solo una hora cada noche.
era
veía

1. Cuando Paquita era joven, le gustaba nadar.

2. De niño, Armando veía la tele solo una hora cada noche.

Explanation:

1. "Iba" means went (from verb to go), while "era" means was (from verb to be). Therefore, "Paquita iba joven" has no sense, but "Paquita era joven"

2. "era" means was (from verb to be), while veía means seen (from verb to see). Therefore, "Armando era la tele" has no sense, but "Armando veía la tele"

when the outside temperature is too cold, an endothermic animal can generate heat by shivering. endothermic animals must eat much more often than ectothermic animals since it takes energy to maintain a constant body temperature.

what exactly am i supposed to answer