There are two answers to this question, depending on where you study. In the United States, a six-kingdom system is taught: animals, plants, fungi, protists, archaebacteria, and eubacteria. In Britain, Australia, or Latin America, a five-kingdom system is used: animals, plants, fungi, protists, and prokaryotes.
The scale outlines the development of Earth and life on Earth.
Most scientists agree that life on Earth appeared 3.6 billion years ago. The first life forms on the planet were prokaryotes.
MERCURY - It is the first planet of the solar system. It is the planet nearest to the sun. VENUS - It is next after mercury, and is also known as morning and evening star. MARS - It is called the red planet. EARTH - It is the only planet (as far as we know) that has life. JUPITER - It is the largest planet. SATURN - It has rings around it and its density is less than water. URANUS - It is the 7th planet. NEPTUNE - It is the last planet of the solar system. it is the coldest planet. we are not able to explore it so much. MERCURY - It is the first planet of the solar system. It is the planet nearest to the sun. VENUS - It is next after mercury, and is also known as morning and evening star. MARS - It is called the red planet. EARTH - It is the only planet (as far as we know) that has life. JUPITER - It is the largest planet. SATURN - It has rings around it and its density is less than water. URANUS - It is the 7th planet. NEPTUNE - It is the last planet of the solar system. it is the coldest planet. we are not able to explore it so much. MERCURY - It is the first planet of the solar system. It is the planet nearest to the sun. VENUS - It is next after mercury, and is also known as morning and evening star. MARS - It is called the red planet. EARTH - It is the only planet (as far as we know) that has life. JUPITER - It is the largest planet. SATURN - It has rings around it and its density is less than water. URANUS - It is the 7th planet. NEPTUNE - It is the last planet of the solar system. it is the coldest planet. we are not able to explore it so much.
Trillions, maybe Quadrillions of years ago. (old answer) On our planet, life begain about 3.8 billion years ago. Heres a timeline http://en.wikipedia.org/wiki/Timeline_of_evolution . And for the other, Inevitably I'm sure their are way more life forms than just on earth. So I cannot say other than that. :) (ask E.T.)lol
"life"
There is a major difference from our planet and the other which is that our planet is the only one that is habitable for life
Planet earth is the only planet that we know of that has life on it.
Earth- We are the only planet that can support life.
Earth is called a life sustaining planet because it has life on it, and is currently the only known planet that supports life.
Earth is a are home planet ,and the only planet that contains life
planet earth is known for being the only planet to support life
Earth is the only planet currently known to have life.
So far the answer is Earth... But we are still looking around...
Earth
Earth
Earth is the only planet known to have life and liquid water.
yes. If you have planet with the same properties as Planet Earth., there will be life on it.