Because Earth is the only planet with oxygen, water and food. And living creatures need these things to survive. We would die in 3 seconds if we don't have air; 3 days if there is no water; and 3 weeks if there is no food.
Water is necessary for life to exist, and since earth is the only planet known to have liquid water, it is the living planet
Food, water, safe habitat, and the ability to successfully reproduce are imperative to survival on this planet.
No, but there is mercury in your food. The planet mercury is barren, there are no living things on it and therefore no food.
Since earth is the only planet we know that has life manyscientists go by what is found here on earth. So, you will need water, oxygen, heat, nitrogen ,and various other chemicals. In addition, some form of food to sustain life living on the planet.
Water, atmosphere.
There is no habitable planet besides Earth that all living things can survive on. If scientists found another planet with water humans could probably survive on other planets but we would need food supplies brought regularly. Plants survive on a certain type of environment, so unless we could create an environment on another planet exactly the same as where the plant came from it would be impossible. Animals are like humans, if they have food supplied regularly enough and a fresh water supply they could live on another planet.
No, but there is Mercury in your food. The planet mercury is barren, there are no living things on it and therefore no food.
Because it is the only planet that have oxygen and have water and food on it.
it has air, food and water
The planet Mercury has no food, no water, and offers no shelter for human beings.
For A Living Planet.