The correct answer is defecation.
<span>Soil productivity is the capacity of a soil, in its normal environment, for producing a plant. A productive soil is a soil in which the chemical, physical, and biological conditions are favourable for plant growth. All organisms, including animals, contribute to the soil by adding organic matter and chemicals via their bodies (decomposition), excrement (through the urinary and digestive system) and food residues.</span>
In developed countries , amount of food produced being increased is a positive effect of agricultural changes in the past century.
Agricultural changes in developed countries were set up such as application of fertilizers etc so as to achieve a maximum yield as the increasing population all over the world means increase in food production to cater for individuals and to prevent starvation and death.
Agricultural changes were also done to ensure goods produced have a very high quality.
The remaining options such as Desertification, Clearing of rainforests and contamination can be referred to as part of the negative effect of agricultural changes in the past century.
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C Time of year I just took the quiz.
The answer is fungi imperfecti or imperfect fungi which are also known as Deuteromycota, are fungi which do not classify into the commonly recognized taxonomic classifications of fungi that are based on biological species thought or morphological features of sexual structures because their sexual form of reproduction has never been observed. Merely their asexual form of reproduction is recognized in which means that these fungi yield their spores asexually in the procedure named sporogenesis.