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:

3 0

2 years ago

Cómo se posible de pinchar un globo sin permitir que se escape el aire y sin que haga ruido?

pochemuha

Answer:

Colocando previamente una cinta adhesiva en la parte donde se va a pinchar el globo

Explanation:

4 0

3 years ago

Change this verb from the present tense to the preterite tense. Yo saco

antoniya [11.8K]

Saque (with an accent) is the answer

5 0

3 years ago