Population refers to an array of organisms of the similar species, which thrives in a particular geographical region and interbreed. The three main characteristics of a population are density, size, and dispersion.
The density signifies towards how many organisms are thriving in a specific region. The size refers to how big a population is, and dispersion signifies towards the degree of spreading of the particular population.
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b) some bacteria reduce nitrate ion
The answer is C, Photosynthesis because it’s an non human activity, it’s energy from the sun