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Early organisms lacked skeletons and other hard structures that are most likely to be fossilized.

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How do fossils show us that environmental conditions have changed?

It is not so much the fossils themselves but the fossil record that show us that the environmental conditions have changed. The evolution of the Earth's Biosphere (living things, the oceans, land surface and atmosphere) began about 3600 million years ago when the atmosphere and oceans had no free Oxygen in them. The first life on Earth (blue green alga and 'stromatolites) slowly produced Oxygen and these are the only fossils we find from this time. As oxygen was produced over the next 3000 million years, it caused iron to be deposited out of the sea water (forming our banded Iron ore deposits) and slowly changing the atmosphere. As the Oxygen built up more complex life forms developed and by 5-600 million years ago the fossils of hard shelled sea creatures are found. Slowly more and more oxygen was released from the sea into the atmosphere and at about 425 million years ago we begin to see the fossils of the first land plants. Animals then began to follow the plants out of the seas onto land and we see fish and amphibian fossils then came the age of the reptiles (dinosaurs) and as we get nearer to the present more and more and more varied animals are found as fossils. Thus Life CREATED the Environment and the fossils prove this. They can be in cold climates or be in hot weather. It depends what their climate is. (:


How many mm is 3 meters?

3 meters is equal to 3000 millimeters.


Is 3000 a leap year?

The year 3000 is not a leap year because centenary years are not leap years unless divisible by 400. (3000/400 = 7.5).


If you had a telescope on a planet 3000 light years away and zoomed in on earth what would you see?

If you had a telescope on a planet 3000 light years away and zoomed in on Earth, you would see the Earth as it was 3000 years ago. Due to the time it takes for light to travel, you would not be seeing Earth in real-time, but rather how it appeared 3000 years in the past.


How many millions of year ago did the first unicellular life appear?

Slightly more than 3000 million years ago, perhaps even as long as 3500 million years ago shortly after the earth's crust cooled just enough for bodies of liquid water to accumulate on its surface.