Why is earth the only inhabited planet in our solar system?

Answer 1

We don't know that it is.

While it certainly seems as if Earth is the only inhabited planet in the solar system, we cannot be entirely certain of this, for two reasons:

1. We're looking for life as we know it, and alien life may be very different.

2. We haven't looked very much: A half-dozen landers on Mars, only one on Venus (and it only lasted for an hour!), and one on one of Saturn's moons. We have hardly looked at all at Jupiter's moons, and Europa could easily have life in its oceans beneath the ice. Our Moon certainly seems lifeless, but again, we've only landed there a few times, and for only a few days each time.

Answer 2

Earth is the only planet with life because it has a lot of Nitrogen. Humans need to inhale Nitrogen to breath. Humans also need other kinds of gases, but mostly Nitrogen.

Answer 3

Earth is the only inhabited planet in our solar system primarily due to its location in the habitable zone, presence of liquid water, and suitable atmosphere for life as we know it. Other planets in our solar system are either too hot, too cold, lack liquid water, or have toxic atmospheres that make them inhospitable to life.