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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:
Dramatico is the correct answer
Answer:
1.Lisa se ducha por la noche.
2.Yo estoy escribiendo una carta.
3.Tengo unos jugetes nuevo.
4.Ella tiene la classe de matemáticas.
5.Los maestros son muy interesante.
