There are 5 main types of pathogens that can harm other organisms and cause diseases. They are viruses, bacteria, fungi, Protozoa, and worms.
Oxygen entered the Earth's atmosphere after the appearance of the Great Oxidation Event (Great Oxygenation Event). The Great Oxidation is the first mass extinction on Earth.
The Great Oxidation lasted 2.4 to 2.0 billion years ago.
Oxygen appeared on Earth thanks to cyanobacteria using photosynthesis.
Necrosis
it is when a cell has a pre mature death
due to an injury or lack of blood supply
The desert? Its completely dry so what other biome?
