Which one of these set of factors is completely abiotic?

Explanation

This Biology question is asking which set of factors is completely abiotic. Abiotic factors are non-living components of an ecosystem. They include physical and chemical factors. Living factors are called biotic factors. The options provided are sets of factors and we are to choose the set that is completely abiotic. Option A includes turbidity, tide, salinity, and plankton. Plankton are living organisms, so this set is not completely abiotic. Option B includes pressure, pH, soil, and insect. Insects are living organisms, so this set is not completely abiotic. Option C includes water, soil, bacteria, and salinity. Bacteria are living organisms, so this set is not completely abiotic. Option D includes light, altitude, wind, and humidity. All these factors are non-living and are examples of abiotic factors. Therefore, option D is the correct answer. In summary, the correct answer is option D, which includes factors that are all abiotic. Biotic factors are living and abiotic factors are non-living components of an ecosystem.