Which term refers to parents' feelings of unhappiness, worry, loneliness, and depression resulting from their children's departure from home

empty nest syndrome.

Explanation:

Empty nest syndrome is a feeling of grief and loneliness parents may feel when their children leave home for the first time, such as to live on their own or to attend a college or university. It is not a clinical condition

i believe

clean air is essential for health and survival

clean air provides nitrogen gas for plant respiration

clean air supplies oxygen that enables living organisms to breathe

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