The correct answer for the question that is being presented above is this one: "oxygen became available from cyanobacteria." About 1.2 billion years ago, eukaryotic and multicelled organisms evolved because oxygen became available from cyanobacteria.
Answer:
saan po yong story
Explanation:
ang earth lang ang ni likha ng diyos na my tao at iba pa
and pLaneta na earth ay mahalaga kasi ito ay my buhay
maliban sa ibang planeta.
An isthmus is a narrow strip of land connecting two landmasses
