Psychologists and other scientists seeking a better understanding of human sexual functioning and dysfunctions face some unique challenges. Describe three of the challenges that you think would make human sexuality a particularly difficult area for scientific researchers to study.

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all soils contain mineral particles, organic matter, water and air the combinations determine the soil's properties – its texture, structure, porosity, chemistry and color. soil is made up of different-sized particles. sand particles tend to be the biggest.