What is a significant observation related to lower testosterone levels?

The observation that lower testosterone levels are linked with shorter anogenital distance is supported by research in developmental biology. Anogenital distance, which is the measurement between the anus and the genitals, has been shown to be influenced by prenatal exposure to androgens, including testosterone. In males, shorter anogenital distance can be indicative of lower testosterone levels during critical periods of development, particularly in utero. This relationship has been utilized as a biomarker for androgen exposure and can be important in studies assessing the impacts of endocrine disruptors or other factors that might affect hormonal levels in the developing fetus.

The other answer options do not accurately reflect established scientific observations. For instance, lower testosterone does not correlate with taller stature; in fact, testosterone is often associated with growth spurts and skeletal maturation. Additionally, stating that lower testosterone has no correlation with physical development overlooks its critical role in development, particularly relating to sexual characteristics and muscle growth. Lastly, the idea that lower testosterone results in increased aggressive behavior is not supported, as testosterone is generally associated with higher levels of aggression rather than a decrease.