Tumors are bunches of abnormal tissue growth, and they can constrict airways, and block your veins and arteries, causing them to be potentially fatal.
It wouldn't flourish because there are no more decomposers. With no decomposition there cannot be a food chain because it all depends on that specific part of the link. You see, the plant population would die. Due to the lack of fungus(decomposers)
Bottom to top is: 1. troposphere 2. stratosphere 3. mesosphere 4. thermosphere
Algae. These pioneer species don't need much to survive, therefore, common pioneer species are bacterial organisms and fungi.