Examlex
Describe the advantages and disadvantages of cluster sampling as compared with simple random sampling.
Mechanical Barriers
Physical or structural methods used to prevent or control the entry or exit of harmful substances or organisms in a particular area.
Skin
The body's largest organ, serving as a protective barrier between the inside of the body and the external environment.
Immunoglobulin
Proteins in the blood plasma, also known as antibodies, which are crucial for the immune system's response against pathogens.
B Cells
A type of white blood cell that plays a crucial role in the immune system by producing antibodies to fight infections.
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