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:
El estudiante debe tomar un examen.
Answer:
SHE=ELLA
Explanation:
because "she" is only used with girl. IN SPANISH WOULD BE ELLA
