Author Question: Tony and Tina are 13-year-old twins. They are both starting to grow hair under their arms, Tina is ... (Read 171 times)

Wadzanai · **on:** Jun 22, 2018

Tony and Tina are 13-year-old twins. They are both starting to grow hair under their arms, Tina is developing breast buds, and Tony's voice cracks on occasion. These are all examples of ____.

A) primary sex characteristics.
B) intersexed characteristics.
C) secondary sex characteristics.
D) postpubescence.

Question 2

Menarche _________

A) occurs earlier for girls with minimal body fat.
B) may but does not necessarily precede the onset of ovulation.
C) occurs at about the same age for most girls, regardless of health or ethnicity.
D) occurs significantly later for girls now than in the past.