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Zero.
The current best estimate for the age of the universe is 13.75 billion years. The first trees are thought to date from the Carboniferous, approximately 359 - 299 million years ago.
As such, 400 billion years ago (roughly 1300 times older than the estimated point when trees first appeared on Earth and approximately 23 times older than the age of the universe) it is VERY unlikely that there were any trees at all.
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∙ 13y ago
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How many trees cover a hectare?
It is impossible to determine how many trees cover a hectare. It depends on the species, the width of them, and how far from or close to each other they grow.
Does the Milky Way have 400 billion stars?
By some estimates, yes.
How many supernovas occur each year?
On average, supernovae occur about once every 50 years in a galaxy the size of the Milky Way. However, there are an estimated 100 billion galaxies. The reason we don't see them all the time, is the shear distance from Earth and the time it takes light to reach us. See related for information about a supernova
How much alcohol is bought a year in US?
There is $400 billion spent a year on the sale of alcohol. This brings in about $21 billion in revenue for states and local economies.
Were spiders alive 400 million years ago?
Yes infact over 400 million years ago!
Approximately how many trees are their on your globe?
Over 400 Billion
Approximately how many trees are there on your globe?
There are approximatley over 400 billion trees on the globe today.
How many decades have there been?
Scientists believe that about 13.7 billion years have passed since the beginning of time. 13.7 billion years is 1.37 billion decades.
What are some landplants 400 million years ago?
There were many plants 400 million years ago. Many of them were very large compared to modern plants. There were trees, cactus, and ferns, to name a few.
How many zeros are in 400 billion?
11
How long was the iron age?
400 billion years ago XD
How many billion is 400000000 million?
400 million equates to 0.4 billion.
How many years would it take to count all the stars in the Star Wars galaxy since there are 400 billion of them?
Counting one star per second, it would take approximately 12,680 years to count all 400 billion stars in the Star Wars galaxy.
How many mammals are in the world?
around 400 billion
0.4 billion is how many millions?
400 million
Did chippanzees ever have tails?
maybe 400 billion years ago, but i dought it.
How many times does sixteen go into 400 billion?
Well, 4 divided by 16 is 1/4, so 16 into 400 billion it must be 100 billion times that. That makes it 25 billion. Or if you like, 400 divided by 16 is 25, leading to the same answer.
