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It is thought that life could not have existed on land until the ozone layer formed about 2 billion years ago Why does life on land require an ozone layer?
Wiki User
∙ 9y ago
Life started to occupy the surface of the earth about about 475 million years ago (plants). Insects followed on land 400 million years ago and reptiles at 300 million years ago. The ozone layer started to form after the atmosphere became richer in oxygen due to the evolution of blue-green algae 2 billion years ago. As result the presence of life on the Earth's land surfaces was far removes (in time) from the creation of the ozone layer.The way evolution works is that the existing land life on Earth requires the ozone layer. However if the ozone was mission life may well have developed with alternate ozone protection (shells, UV reflective colours, a more UV resistant chemistry. present life would not do well in a high UV environment but this is not to say that land life could not have developed in such an environment.
Wiki User
∙ 9y ago
Wiki User
∙ 8y agoThe abundance of ultraviolet radiation would have destroyed them.
there was no carbon dioxide until the atmosphere formed for the plants to breathe
Wiki User
∙ 13y agothere was no carbon dioxide until the atmosphere formed for the plants to breath
Wiki User
∙ 9y agoComplex Organisms couldn't develop before ozone. It was because of UV rays that kept destroying them.
Wiki User
∙ 9y agoLife on land require ozone. It is because it block UV which block the life formation.
Wiki User
∙ 9y agoWithout ozone there was no life. Mankind will also not exist.
Wiki User
∙ 9y agoComplex organisms could not develop before ozone. It was because of UV entering earth.
Wiki User
∙ 9y agoyes
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What continent formed in 0.7 billion years ago?
Rodinia was the continent that existed 0.7 bya.
Scientist believe that the more distant galaxies are formed when?
Far or near, all galaxies were thought to be formed in the first half billion years of the formation of the universe ... that is, about 13 billion years ago. Note that we're seeing the distant ones in a younger stage of development.
Were rocks that are 3.5 billion years present when earth was first formed?
No, rocks that are 3.5 billion years were not present when earth was first formed. Earth formed about 4.6 billion years ago.
What were the continents called when they were all together?
When the continents were all together, they were called supercontinents. The Earth is thought to be 4.6 billion years old. The oldest theorized supercontinent is Vaalbara, which may have formed 3.3 billion to 3.6 billion years ago. The oldest known supercontinent is Ur, which formed 3 billion years ago. The Kenorland supercontinent formed 2.7 billion years ago. Columbia formed 1.8 billion to 1.5 billion years ago. Rodinia formed 1.1 billion to 750 million years ago. Pannotia, which also is called the Vendian supercontinent, formed 600 million to 540 million years ago. Pangaea formed 500 million to 200 million years ago. Laurasia formed 200 million years ago. And the last supercontinent was Gondwana. But that title may be held only temporarily by Gondwana. For the future may hold possibilities of one or two supercontinents within the next millions of years.
Is the Cascade Mountain Range older than the Rocky Mountains?
No. That honor would go to the Porcupine Mountains in Northwest Michigan. They were formed 2 billion years ago. It was formerly and erroneously thought that the Saint Francois Mountains of Southeast Missouri (formed 1.4 Billion Years ago). The Appalachian Mountains were formed only 460 million years ago..
It is thought that life could not have existed on land until the ozone layer formed about 2 billion years ago. Why does life on land require an ozone layer?
Because the ozone layer provides a thin layer of protection from the harmful UV rays or ultraviolet rays.
How long has the earth existed for?
4.6 billion years ago the earth was formed
What continent formed in 0.7 billion years ago?
Rodinia was the continent that existed 0.7 bya.
Is it through that life could not have existed on land until the ozone later formed about 2 billion years ago why does life on land require an ozone layer?
Life on earth requires an ozone layer. It is because it absorbs the fatal UV rays of the sun.
When did land start to exist on earth?
The Earth formed some 4 to 5 billion years ago. Solid land formed as it cooled about 2.5 and 3.8 billion years ago. No seas existed until the Earth had cooled enough not to boil water back into vapour.
How long has the earth been here?
Current estimate of the Earth's age is about 4.5 billion years. The total age of the Universe (Big bang until now) is about 15 billion years.
Scientist believe that the more distant galaxies are formed when?
Far or near, all galaxies were thought to be formed in the first half billion years of the formation of the universe ... that is, about 13 billion years ago. Note that we're seeing the distant ones in a younger stage of development.
What is meant by ganadwanaland?
Gondwanaland ?Its the continent that existed about half a billion years ago and was formed from what now is South America, Africa, Antarctica , Australia, Arabia, Madagaskar, New Guinea and India.
When did Mrcury become a planet?
The planet Mercury, along with the other planets in our solar system, is thought to have formed about four and a half billion years ago.
Were rocks that are 3.5 billion years present when earth was first formed?
No, rocks that are 3.5 billion years were not present when earth was first formed. Earth formed about 4.6 billion years ago.
How was God formed?
Christians believe that God has always existed, He was not formed.
Billions of years ago galaxies existed in?
Galaxies. They are just about the same now as they were then. 14 Billion years ago, astronomers believe that the "Big Bang" created matter from energy, which is how they believe galaxies were formed.
