Why do scientists believe that life first emerged from the ocean and onto land well after the ancestors of modern-day cyanobacteria populated the Earth?
Answer
The ancient cyanobacteria converted the Sun's radiant energy to heat, warming the ocean waters. They eventually drove many organisms from the oceans and onto land.
The cyanobacteria produced radiant energy from the nitrogen and carbon it absorbed from the shallow sea floor. Organisms needed this light energy to see on land.
These bacteria provided a much needed chemical energy source for organisms living at the shoreline. With

Question

Why do scientists believe that life first emerged from the ocean and onto land well after the ancestors of modern-day cyanobacteria populated the Earth?
Answer
		The ancient cyanobacteria converted the Sun's radiant energy to heat, warming the ocean waters. They eventually drove many organisms from the oceans and onto land.
		The cyanobacteria produced radiant energy from the nitrogen and carbon it absorbed from the shallow sea floor. Organisms needed this light energy to see on land.
		These bacteria provided a much needed chemical energy source for organisms living at the shoreline. With