Which of the following is a secondary sex characteristic produced by estrogen?

The broadening of the pelvis is a secondary sex characteristic influenced by estrogen, particularly during puberty and development. Estrogen plays a crucial role in the physical changes that occur in females, including the widening of the pelvic bones, which is an adaptation to prepare the body for potential childbirth.

While estrogen affects body fat distribution, leading to a more feminine silhouette (which helps in the overall characteristics associated with womanhood), the specific physical change of pelvis broadening is distinctly observable and directly attributed to the influence of this hormone. This change is significant as it differentiates female anatomy from male anatomy and is essential for reproductive capabilities.

Other options do not correctly represent secondary sex characteristics associated with estrogen. For instance, decreased sexual desire is not typically attributed to estrogen; instead, it may occur due to various other hormonal factors. Deposits of fat in the abdomen can relate to various factors including lifestyle and genetics rather than being a primary effect of estrogen alone. Excessive hair growth is more related to androgens than estrogens, making it not a fitting characteristic linked to estrogen.