Itd seem like a virus would replicating and once the host cell cannot contain the viruses anymore, the cell explodes and releases all the viruses into the blood stream
Radioactivity due to heavy elements
Friction caused by earths fast rotation
Guttation is the process of loss of water from the surface of leaves in the form of liquid drops... Guttation occurs when root pressure is high and transpiration is low.
If photosynthesis stopped, plants would stop converting carbon dioxide -- an air pollutant -- to organic material. ... Even if all the plants on Earth were to die, people would remain resourceful -- especially if their lives depended on it.