The independent variable is associated mainly with? a. control and experimental groupsb. the treatment that the researcher controls directly c. the result of experiment d. the hypothesis

The correct answer is B. The independent variable refers to what is being tested by a researcher in an experiment

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The answer is a. soil fertility is dependent on the balance between organic matter and mineral nutrients.Organic matter in soils comes from the dead and decaying parts of plants and animals and animal droppings. Decomposers in ecosystems break these material down to form humus. Decomposers are essential in the nutrient recycling process. The moneral component in soils is dependent on the parent rock present. Weathering breaks down rocks to form soil. Igneous rocks for example weather to form fertile soils.