Answer: Option D
:
D
Primary sexual characteristicsare present from birth and are directly concerned with reproduction and allow the differentiation of males and females. The ovary in females and penisin males are primary sexual characters. Secondary sexual characters appear during puberty due to the hormones released during this time. Primary and secondary sexual characteristicsdifferentiate males and females in a sexually dimorphic species. Secondary sexual characteristics are not concerned with reproduction or production of gametes.