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:
No entiendo lo q quieres dicer
El comedor es pequeno -----the dining room is small.
Pues claro que si parce el sistema nervioso pertenece a la espinal
Answer:The old red cat
Explaintion: i did this already
