Hazards are substances derived from organisms that pose a threat to the health of humans, animals and/or plants.

Biological hazards.

Explanation:

Biological hazards are substances derived from the metabolism of microorganisms that threaten the health of humans, animals and / or plants. Biological hazards include microorganisms such as bacteria, viruses and parasites. These microorganisms are often associated with food contamination, but their harmful effects can be seen in any living organism susceptible to contamination. The way to reduce this kind of danger is to maintain hygiene, temperature control, and any other activity that avoids the multiplication of microorganisms.

primary succession occurs in essentially lifeless areas regions in which the soil is incapable of sustaining life as a result of such factors as lava flows, newly formed sand dunes, or rocks left from a retreating glacier. secondary succession occurs