The prefix "estro-" is associated with which of the following?

The prefix "estro-" is derived from the Greek word "estrus," which refers to the period of sexual receptivity in female mammals, commonly associated with the estrous cycle. This prefix is often used in biological and medical terms related to female reproductive functions and hormones, such as "estrogen," which is a primary female sex hormone responsible for the regulation of the reproductive system and secondary sexual characteristics in females.

In contrast, the other options relate to different demographics or characteristics. For example, "male" pertains to the male gender, "child" refers to a young human, and "adult" signifies a fully developed individual, neither of which are directly associated with the prefix "estro-." Understanding the contextual use of prefixes in medical and biological terminology helps clarify their specific connections to gender or demographics.