Trees that have thick, waxy needles to prevent water loss and protect from cold would most likely be found in which biome

The trees that have a thick, waxy coating on their surface of their needles, are found in the Taiga biome. The plant diversity is less in such ecology. The most common types of trees are the conifers. 

Adaptation of waxy coating and needles help them to retain water, and protect them from cold. 

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