Question

1. Early organisms changed the Earth by
a creating early forms of life.
b. multiplying in great numbers over millennia.
e producing oxygen and ozone to sustain life.
d making the web of life.​

Answer 1

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Scientists believe microbes called cyanobacteria living in the ocean kick-started the transformation when they began to photosynthesize. Oxygen, a byproduct of photosynthesis, accumulated in the ocean, then percolated into the atmosphere.....

please mark as brainliest...

Answer 2

Answer:

according to me all are correct answer

Explanation: