[Solved] Which of the following is not considered a questionable business practice made possible by the Internet? A) plagiarism B) pornography C) gambling D) music downloading Cardiovascular System: The system comprising the heart and blood vessels, responsible for circulating blood throughout the body to supply oxygen and nutrients. Organization Level: Refers to the hierarchy in biological systems, ranging from atoms to biosphere, delineating the complexity and interaction levels. Cytology: The study of cells, their structure, function, and chemistry, often used in medical diagnostics. Cell Chemistry: Refers to the chemical processes and reactions that occur within living cells, which are crucial for maintaining life.