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One of the major factors limiting the size of insects today is the amount of oxygen in the atmosphere. Currently, the atmosphere is about 21% oxygen. At earlier times, the oxygen concentration was as high as 36%. Vertebrates now largely rule as the large land animals.
What else can I help you with?
Where was the ozone layer invented?
In the atmosphere. Hundreds of millions of years ago.
When were jewel beetles invented?
People did not invent beetles, they evolved hundreds of millions of years ago.
What organisms that lived hundreds of thousands of millions of years ago with bodies divided into three sections?
hundreds of thousands of millions of years ago is too far in the past - the universe is only 13.75 billion years old!However I know what you are asking and the organisms divided into three parts were the "trilobites". They lived about 500 million years ago.
Is there a start to the water cycle?
It is assumed that water arrived on Earth from space, hundreds of millions of years ago.
What does the time scale of life encompass-tens of millions or hundreds of millions of years?
There is evidence for life on earth at least some 3,600 million years ago. So the answer is non of the above but "thousands" of millions of years.
Where did the energy come from to create coal?
i think its from the energy stored by plants that lived hundreds of millions of years ago.=]
Why is there a fossil fuels?
There are fossil fuels because things (like plants and animals) died hundreds of millions of years ago. Most Fossil fuels are non- renewable. Meaning they will not replenish untill we are dead and gone for hundreds of millions of years.
Is a Brontosaurus roaming Africa's wilds?
No chance. The dinosaurs died out hundreds of millions of years ago. Birds are descended from the survivors.
Millions of years ago what city had the same name as today?
There were no cities millions of years ago.
When did fossil fuel plants and animals live?
Fossil Fuel Power Plants were created when.....
How many millions of years ago did the era in which you live begin?
it would be around 650 millions of years ago
When were humans on earth?
millions and millions of years ago
