Hey! I'd love to help you. I wanted to know if you have an answer, and would like me to write it in Spanish for you OR I can answer it myself in Spanish and just give it to you. Let me know.
Answer:
I believe that it is CONDITIONAL TENSE
Explanation:
Frequently, the conditional is used to express probability, possibility, wonder or conjecture, and is usually translated as would, could, must have or probably.
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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:
