Scientists think that algae first evolved approximately 2.7 billion years ago, and soon after this oxygen began to exist in the atmosphere. Photosynthesis by primitive plants and algae released oxygen, which gradually built up in the atmosphere.
Explanation:
Answer:
C
Explanation:
Im hispanic and it's proper grammar
Answer: b, le
Explanation:
It’s past tense so like boom grammar
Answer:
Explanation:
Compramos los pasajes por Chile. Salimos el martes. Incorrecto. This sentence is wrong, the correct preposition is para. Compramos los pasajes para Chile.
1. El autobus pasó por los bosques. correcto. This sentence is right, the preposition is por.
2. Fui al centro comercial y compré un juguete por mi sobrino. Incorrecto. This sentence is wrong, the correct preposition is para. Fui al centro comercial y compré un juguete para mi sobrino.
3. Estuvieron en Barcelona por tres semanas. correcto. This sentence is right.
