Which of the following is not a factor in determining population size? a. the food supply b. birth rate c. available niches d. detritivore activity

The correct answer is D. detritivore activity.

Population size can be defined as the number of organism living in a particular area.

The change in the population i.e. population rate is influenced mainly by four factors which are death rate, birth rate, immigration, and migration.

Other factors which can affect the population size are limiting factors, carrying capacity etc.

For example, scarcity of food can lead to a severe decline in the population size etc.

In contrast, detritivore or decomposer's activity helps in recycling of the nutrients in the environment by decomposing the dead plants and animals. However, they don't play any major role in determining the population size.

in 1859, charles darwin set out his theory of evolution by natural selection as an explanation for adaptation and speciation. he defined natural selection as the "principle by which each slight variation [of a trait], if useful, is preserved".

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