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There was no oxygenated atmosphere on primordial Earth, and thus no ozone layer to protect early life from the sun's ultra-violet rays. The oceans, however, did offer some protection and so it follows that the waters were the cradle of life.

The first organisms, (cyanobacteria), produced oxygen by means of photosynthesis. It took more than 3 billion years for cyanobacteria and archaea to produce an atmosphere, oxygenated oceans and soils fit for eukaryotic life.

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Q: Why are the oldest fossils the remains of marine not terrestrial organisms?
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What is liquid from the remains of marine organisms?

Fossils are formed from the buried remains of marine organisms. These organisms are under a tremendous amount of pressure and, over time, they fossilize.


Are the white cliffs of dover make from fossils or is the lime made from a chemical reaction?

The cliffs are chalk, a form of limestone from the remains of small ancient marine organisms.


How is possible for the remains of marine fossils to be found in the Alps?

The marine fossils that are found in the Alps were once on the bottom of the ocean. Plate collision has resulted in their uplift.


What does it mean if liquid from remains of marine organisms?

Fossil fuel


The remains of these form oil and natural gas?

Marine organisms.


The occurrence of marine fossils in rock strata located high in terrestrial mountain ranges can be attributed to?

uplift associated with plate tectonics


What fossils are most likely to be found in rocks?

Small shelled marine organisms are the most common easily observable fossils found in rocks.


Did most fossils com from dinosaurs?

Fossils exist of nearly all formerly living organisms, with some exceptions, from single celled bacteria to the largest dinosaur. Marine organisms comprise the bulk of fossils that are easily available today.


Is a fossil fuel formed form the remains of marine plants and animals?

Yes, fossil fuel is formed from fossils.


How does petroleum form?

Petroleum is formed under Earth's surface by the decomposition of marine organisms. The remains of tiny organisms. EW!


What happens to the remains of dead marine organisms to transform them into oil and gas?

The dead marine organisms are oil and gas now and the people used them for gas and fuel cost companies.


Is coal formed from the buried remains of marine organisms?

No, it is formed when forests die and are covered with layers of rock which compress it and over time turns it into coal. Buried remains of marine organisms formed oil, following mass extinctions,where the oceans have stagnated.