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:
You could use multiple words in that blank. For example:
Para el postre, quisiera pastel.
Para el postre, quisiera helado.
Answer:
A. Una tormenta está caracterizada por mucha lluvia, viento, relámpagos y truenos.
Explanation:
This means that there is lots of rain and the people are holding umbrellas.
<h3>Which verb form correctly completes this sentence? El próximo verano, Alejandro _______ a mochilear a la montaña Cotopaxi.</h3><h3>A. Irá B. Iremos C. Irán D. Irás </h3>
Answer: A.) El próximo verano, Alejandro irá a mochilear a la montaña Cotopaxi.
Translation: Next summer, Alejandro will go backpacking to the Cotopaxi mountain.
Explanation: The subject in this sentence is Alejandro, that is the third-person in the singular, so the verb must be conjugated in this form. Él irá.