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Starting billions of years ago algae lowered the?

...lowered the level of CO2 in the atmosphere and released O2


How many years ago was mars formed?

about 4.5 billions years ago.


When was Malta made?

Billions of years ago.


Does water came from asteroids billions of years ago?

No, water did not come from the asteroids a billion of years ago.


What year was the beginning of Dinosaurs?

nobody knows for sure, but they begans billions and billions of years ago


Why do scientist see the galaxies if they were millions and billions of years ago?

The galaxies beyond our own are millions to billions of light years away, meaning the light takes millions to billions of years to get here.


What year was Mt Vesuvius created?

probably billions of years ago


Where did the ancestors come from?

Our ancestors came from Africa billions of years ago


Is the mantle the evidence of how earth look like when it was first formed 4 billions years ago?

The mantle is not the evidence of how earth looked like when it was first formed 4 billions years ago, but the biogenic graphites.


How long ago was big bang?

The Big Bang is estimated to have occurred around 13.8 billion years ago, based on observations and measurements of the universe's expansion and the cosmic microwave background radiation.


Where did life start?

Life first began in the oceans, billions of years ago.


How do scientists think that the first multicellular organism arose?

The oldest fossils of multicellular organism are from tiny algae that lived about 1.5 billions years ago. By 600 million years ago the first multicellular animals-jellyfish-like organisms -had evolved.