Ideas in this flowchart

• Physiological needs
• Physiological needs are the physical requirements for human survival.
• They are considered the most important needs and should be met first.
• If they are not met, the human body cannot function properly and will ultimately fail.
• Air, water, and food are metabolic requirements for survival in all animals, including humans.
• Air is a metabolic requirement for survival.
• Water is a metabolic requirement for survival.
• Food is a metabolic requirement for survival.
• Clothing and shelter provide necessary protection from the elements.
• Clothing provides protection from the elements.
• Shelter provides protection from the elements.
• The human sexual instinct is also related to physiological needs.
• Maintaining an adequate birth rate shapes the intensity of the human sexual instinct.
• Sexual competition may also shape the sexual instinct.