Question
Differentiate between population size and population density.
| Population size | Population density |
| Population size refers to the number of individuals of a species in a given area at a given time. | Population density Refers to the number of individuals of a species per unit area at a given time. |
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| S.No. | Type of barrier | Example of the barrier | Function |
| (і) | А | B | Prevent microbial growth |
| (ii) | C | Polymorpho nuclear leucocytes | D |
| (iii) | Cytokine | E | F |