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:
The answer is <span>estacionamiento, meaning parking lot.
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The answer is I am in art class.
Answer:
No están seguros de que Pedro pueda dejar de fumar.
No es evidente que estés agotado.
No creo que las medicinas naturales son curativas.
No es verdad que la cirujana quiera operarte.
Es seguro que este médico conoce el mejor tratamiento.
Explanation:
They are not sure that Pedro can quit smoking.
It is not obvious that you are exhausted.
I do not believe that natural medicines are curative.
It is not true that the surgeon wants to have surgery.
It is certain that this doctor knows the best treatment.
You can play soccer, Baseball, have a picnic, and any other fun activity like that!
Puedes jugar fútbol, béisbol, hacer un picnic y cualquier otra actividad divertida como esa.
