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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.


What is the planet that has life?

At the moment, only the planet Earth is known to have life. All the others are speculation based on nothing more than distance from the Sun and the possible existence of water. It will be many hundreds, if not millions of years before we can prove that life exists on another exoplanet.


What is Mars sister planet?

Actually I believe that the asteroid belt between mars and Jupiter was Mar's sister planet. However it was destroyed somehow hundreds of millions of years ago and could have possibly stripped Mars of it's life giving atmosphere.


What element was named after the planet Pluto and stays radioactive for millions of years?

Plutonium is the element named after the planet Pluto. It is a radioactive element with a half-life of thousands of years, not millions.


What causes carbon?

Carbon is a building block of all life and is an element that naturally occurs on this planet. There is the same volume of carbon on the planet today as their was millions of years ago.


Is it true that earth today has been sustaining life for millions of years?

Not just millions. Earth has sustained life for several billion years.


What would happen to the earth if you did not have these greenhouses gases in the atmosphere?

The earth would be too cold for life. Greenhouse gases have been essential for life on this planet, and have kept Earth warm for millions of years.


How long ago was there life on Earth?

Millions of years


Has the water on earth today been sustaining life for millions of years?

Yes, water on Earth has been sustaining life for billions of years. Water is essential for life as we know it to exist, and it has played a crucial role in the evolution and survival of organisms on our planet.


What country do mushrooms come from?

Mushrooms have been around far longer than countries have. You can be pretty sure that every country on Earth has mushrooms and had them before it was ever a country. Mushrooms are just the part of fungi that we see above ground. Fungi are one of the oldest forms of life on the planet and were here hundreds of millions of years before people.


How long has earth been a planet?

The Earth has been a planet for approximately 4.5 billion years. It formed from the primordial solar nebula as a result of the process of planetary accretion.


Was there life on earth from the start?

No, the Earth was uninhabitable for millions of years.