Examlex
Which of the following features is NOT a characteristic used to distinguish birds?
Levitra (Vardenafil)
A prescription medication used to treat erectile dysfunction, working by increasing blood flow to the penis.
Spermatogenesis
The process of sperm cell production in the testes.
Coitus
The sexual act between a male and female involving insertion of the penis into the vagina, also known as sexual intercourse.
Orchidectomy
A surgical procedure to remove one or both testicles.
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