By definition, positive psychology is the study of a healthy mind and it is a applied to achieve peak operational functioning of the mind. It does this by identifying and promoting qualities that lead to happy, fulfilled and contented lives. Positive psychology is based onnurturing what is best withing oneself, therebyimproving both individuals and communities.
All of them. Air because in helps make food it also lets the plant breath. Water because it helps move nutrients into the plant. Soil because plants can’t grow without soil.