Why Haven't Scientist Found Life On Other Planets In The Solar System?

For the existence of life there are certain important factors required like, the availability of water and food, air or oxygen and a hospitable temperature. Our earth possesses all of these. Other planets lack these. For example mercury is too close to the sun. The temp there is quiet high and unbearable. So life cannot exist. If water was present it would evaporate due to the high temp.  Plants would burn. Pluto is quiet far away from the sun. The heat cannot reach there properly. The climate is severely cold, thus no life exists. Mars don't have water. And so every planet is lacking something, which makes them unsuitable for life.