Human population growth serves as an important model for population ecologists, and is one of the most important environmental issues of the twenty-first century.
Fluids that Spread Bloodborne Pathogens. The transmission of bloodborne pathogens from one person to another occurs through the transfer of infected body fluids. Common body fluids which can transmit pathogens include: blood. cerebral spinal fluid. semen. vaginal secretions.
People infected with HIV carry the virus in their body fluids, including blood, semen, vaginal secretions, and breast milk. The virus can spread only if these HIV-infected fluids enter the bloodstream of another person.