[Solved] When oxygen is not present in contracting muscles, ____________________ is formed that contributes to ____________________. Cyberporn Surfers: Individuals who frequently browse or search for pornography on the internet. Teenagers: A phase of human development following childhood and before adulthood, generally considered to range from ages 13 to 19. Married: The state of being united to a person as a spouse through legal, cultural, or religious ceremonies and practices. Internet Gambling: The practice of engaging in betting or wagering activities online, including poker, casinos, sports betting, and lotteries.