he period when secondary sex characteristics develop is calledSelect one:a.coitus.b.orgasm.c.condom.d.puberty.

Break Down the Problem

1. Identify the keywords in the question: "period," "secondary sex characteristics," and "develop."
2. Recognize that this is related to human development and biological maturation.

Relevant Concepts

1. Secondary Sex Characteristics: These are features that appear during puberty, which differentiate the sexes but are not directly involved in reproduction.
2. Puberty: A developmental stage characterized by physical growth and sexual maturation.

Analysis and Detail

1. Coitus refers to sexual intercourse and is unrelated to the development of secondary sex characteristics.
2. Orgasm is a physiological and psychological response to sexual stimulation, which also does not pertain to the development phase.
3. Condom is a contraceptive device and does not define a developmental period.
4. Puberty is specifically the period during which secondary sex characteristics develop due to hormonal changes.

Verify and Summarize

Considering the definitions of all options, the correct answer is clearly connected to the phase when secondary characteristics develop.

Final Answer

d. puberty.