Sad wiki:
[o an emotional condition, the antonym of "happy". Sadness is often associated with depression, suffering or grief.SAD is a three letter acronym for multiple medical and psychological disorders:Schizoaffective disorderSeasonal Affective DisorderSexual Arousal DisorderSocial Anxiety Disorder.It is also the acronym for an Indian political party, the Shiromani Akali Dal.
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Tree wiki:
>This article is about the biological organisms known as trees. For other meanings of the word see tree (disambiguation). A tree can be defined as a large, perennial, woody plant. Though there is no set definition regarding minimum size, the term generally applies to plants at least 6 m (20 ft) high at maturity and, more importantly, having secondary branches supported on a single main stem or trunk (see shrub for comparison). Compared with most other plant forms, trees are long-lived. A few species of trees grow to 100 m tall, and some can live for several thousand years.
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