B, the others are not testable under lab conditions.
Answer;
Both genes and the environment
Both genes and the environment direct and produce human behaviors, personality traits, and even psychological disorders.
Explanation;
-Human behavior is determined by complex interactions of both nature and nurture. Genetic make up of a person together with the environment influences the physical and behavioral characteristics of an individual.
-Personality is a complex trait that is influenced by many different genetic and environmental factors. Personality traits are also polygenic trait because multiple genes are involved in determining these traits. Because a large number of genes each playing a small role in determining our personality, it is difficult to isolate and identify these genes.
<span>The question says,'decomposition of plants and animal matter present in the soil is largely due to soil micro organism. The statement is true. The soil microbes function by decomposing the organic matter in the soil to the forms usable to plants. The humus produce by these microbes is largely responsible for soil fertility. </span>
