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:
Based on the dialogue, The cloud applauds
Ustedes siempre leen en la clase de espanol.
Yo pase el verano pasado en Madrid.
Answer:
Juan <u>Quisiste</u> ver el juego de ......
