Why is there life on earth?

There are many reasons why this happens. Reason One: Atmosphere. Earth has a breathable atmosphere. Oxygen is the gas that is required for the life of most creatures. This is present in Earth's atmosphere and also in water. Oxygen is constantly put into the atmosphere by plants and trees. read more

So, there still might be life on other planets, or even the moons of other planets, but it would probably be very different than life on Earth! These other possible forms of life would be very far away so they are not something to worry about. read more

There are a few key ingredients that scientists often agree are needed for life to exist — but much debate remains as to what limits there actually might be on life. Even Earth hosts some strange creatures that live in extreme environments. read more