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Early organisms lacked skeletons and other hard structures that are most likely to be fossilized.
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∙ 12y ago
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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. (:
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).
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.
How many mm is 3 meters?
There are 3 million mm in 3 meters.
If the suns core was 3000 degrees how hot is the whole sun?
15 million c
How many continents were there 3000 million years ago?
We THINK there was one. However, there were no people around 3000 million years ago, so we can't say for sure.
Which is bigger 3000 days or 1 decade?
1 decade or 10 years is greater than 3000 days
How many years is 3 millennium?
Three millennia (the plural of millennium) is 3000 years. Each millennium is 1000 years. (A millennium is not one million years, despite sounding like "million".)
About how old would you be if you lived a million days?
you must be approximately around 3000 years old.
Is 2 tons greater than 3000 pounds?
Is 3000 pounds greater or less or equal to 2
What does 3000 k mean?
3 million k = kilo = thousand so 3000 k = 3000 thousand = 3,000,000 = 3 million
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. (:
What is 3000 thousands in standard form?
It is: 3,000,000 = three million
Which is greater 3000 km or 1 km?
3000 km, of course!
What is greater 3000 lb or 3T?
3,000 is greater then 3t
What is 6000 million divided by two?
It is: 3000 million
Is 4 liters greater or less than 3000 milliliters?
4 liters greater or less than 3000 milileter
