Correct because it’s talking about more than one person, it’s talking about “us”
"Esta" is the incorrect part, it should be changed to plural and masculine, which is "estos"
Answer:
Dalton's atomic theory proposed that all matter was composed of atoms, indivisible and indestructible building blocks. While all atoms of an element were identical, different elements had atoms of differing size and mass.
Explanation:
This other example Rojo femenino- sustantivo
Answer:
1. Los astrónomos detectaron una nueva constelación.
2. Un biólogo ecuatoriano descubrió cinco especies nuevas.
3. Los matemáticos resolvieron el problema de geometría.
4. El transbordador espacial volvió de su última misión.
5. Los estudiantes vieron una estrella fugaz.