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Microorganism must be found in small amount in some organisms suffering from a disease and should be found in healthy organisms does not represent on of Koch's postulates. The truth is that microorganism should be found in large quantities in all organisms suffering from a disease, but they should not be found in healthy organisms.
Small sized animals need less food as compared to large sized animals. A field of plants can support more numbers of small animals as compared to large sized animals which need more food, it is why smaller animals are numerous .
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An infectious disease is a medical condition caused by the growth and spread of small harmful organisms, such as bacteria, viruses, fungi, or parasites, within the body. These organisms can cause symptoms and harm the body's normal function, leading to illness. Treatment usually involves antibiotics, antiviral medications, or other specific therapies to target the particular organism causing the infection.
Large organisms feed off small ones.
Smallpox. Louis Pasteur discovered the vaccine for small pox, using the cow pox organisms.
A virus is a type of disease-causing organism that is so small it can only be seen using a microscope. Viruses are much smaller than bacteria and can only replicate inside living cells.
They are microorganisms, consisting of only one cell, and they are so small that they cannot be seen with the unaided eye. Some organisms are smaller than amoebas, but they are still very small.
Usually, there are more small organisms than large ones.
Small animals that can live in severe conditions -Apex
Microorganisms are tiny living organisms that are too small to be seen with the naked eye. They include bacteria, viruses, fungi, and protists, and play important roles in various ecosystems, including nutrient recycling and disease processes.
They are called decomposers.