Portola Valley is one of the forty wealthiest towns in the United States, with a median household income of $244,771 a year. Within the State of California, Portola Valley is ranked as the sixth wealthiest place. The zip code 94028, which encompasses the whole of Portola Valley, has the 9th most expensive housing prices within the country according to Forbes Magazine 2013.
The male gonads are the testes and the female gonads are the ovaries. These reproductive system organs are necessary for sexual reproduction as they are responsible for the production of male and female gametes.
RECOMMENDED LESSONS: The male reproductive system. The male reproductive system includes the testes (say test-eez), prostate glands, sperm ducts, urethra and penis (P). Sperm duct. During mating, sperm cells released pass through the sperm ducts. Testes. There are two testes (one of them is called a testis).he male reproductive system includes the testes (say test-eez), prostate glands, sperm ducts, urethra and penis (P). Sperm duct. During mating, sperm cells released pass through the sperm ducts.