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After the Daodejing, the second _______ classic is the Zhuang Zi.
Scrotum
The pouch of skin containing the testicles in male mammals.
Testosterone
A primary male sex hormone crucial for the development of male reproductive tissues, as well as promoting secondary sexual characteristics.
Secondary Male Characteristics
Physical changes that occur in males during puberty, such as facial hair, voice deepening, and increased muscle mass, not directly involved in reproduction.
Vas Deferens
A tube that transports sperm from the testicle to the urethra in males.