The answer is fossil record
All three would decrease the size of the population of the organism. If an organism suddenly has a new predator, the organism's population will decline and it is likely that the members of the prey's population would disperse in an attempt to survive. Disease would just kill off the population in general, maybe the organism's population would distribute itself differently in order to avoid catching the disease. Competition would decrease the amount of food, water, and/or land available to the organism's population causing it to decrease or change habitats in an attempt to find another food source
Diagnosis and identification of pathogenic bacteria is important for correct disease diagnosis.
Pathogenic bacteria are the one that causes disease in humans. many species of bacteria are harmless but some can be infectious and causes sever disease . So, the correct identification of disease causing bacteria is very important for prevention and control .
Your body can be more prone to bacterial infections when your immune system is compromised . Antibiotics are used to treat bacterial infections. In general raw food from animal origin contain most of the pathogenic bacteria like uncooked meat ,raw or lightly cooked eggs raw fishes .
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