Answer: A
Explanation: The sentence is in past tense and “salieron” is also in past tense, so that’s why A is the correct answer.
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:
1) irá
2) vuelvan
3) espere
4) vaya
5) ven
6) hablen
7) pida or pedirá (depending on the context)
8) haz
9) come
10) escucha
Answer:
52:1
Explanation:
468:9 = 52
That is, on average, there are 52 students per classroom. The ratio is 52 students per classroom.
