On Oct. 27, 2018, a lone gunman entered the Tree of Life synagogue in Pittsburgh, Pennsylvania and opened fire, killing eleven people. Since then, hundreds more in the US have been killed in mass ...

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All tree leaves have an outer layer called the epidermis, which can also be used in the identification process. This leaf "skin" always has a waxy cover called the cuticle and varies in thickness.

There are 49 species of pine tree native to North America. Non-native species have also been introduced to the United Sates, as ornamental trees in landscaping.