Question

how life began origins nova neil degrasse tyson hd
possible points: 2.22
cyanobacterias photosynthesis changed earths atmosphere dramatically. which statement best describes the long - term consequence of this event?
it led to mass extinction of all oxygen - using organisms
it enabled evolution of aerobic and multicellular life forms
it reversed evolution, leading to simpler organisms
it caused the oceans to freeze permanently

Explanation:

Cyanobacteria's photosynthesis released oxygen. Aerobic organisms require oxygen. Multicellular life also benefited from the oxygen - rich environment. Mass extinction of oxygen - using organisms is incorrect as oxygen allowed their evolution. Reversing evolution to simpler organisms is not a consequence. Oceans freezing permanently is not related to cyanobacteria's photosynthesis.

Answer:

It enabled evolution of aerobic and multicellular life forms