Ideas in this flowchart

• Physiological needs are physical requirements for human survival.
• These needs are considered the most important and should be met first.
• If physiological requirements are not met, the body cannot function properly.
• Ultimately, the human body will fail when these requirements remain unmet.
• Air, water, and food are metabolic requirements for survival in all animals, including humans.
• Clothing and shelter provide necessary protection from the elements.
• Maintaining an adequate birth rate shapes the intensity of the human sexual instinct.
• Sexual competition may also shape the human sexual instinct.