LoveUniHateExams, spherical objects can have inorganic origins. A metor crash can easily raise temperatures to the melting point of silica, and the molten blobs can harden into spheres if they spend enough time in the atmosphere. Until we collect some of those spheres and examine them, we cannot know how they formed.
Personally, I believe that as we extend our exploration of the solar system we will find that any planet or moon with liquid water we will find life. Even on Pluto, with its suspected water and obvious reddish-brown "tholins".