What do trees have in common?

All trees have roots. Roots allow moisture and nutrients to be taken from the soil in which they grow. The roots are deep, in the form of a rod, or branched and superficial: deep roots can take moisture from the soil layers that are deeper, trees with superficial roots have enough moisture in the surface areas of the soil. Different trees grow in places with appropriate moisture, trees with deep roots grow in arid regions, and trees with a small root system grow in wet regions. Trees evaporate moisture with their greenery – leaves or needles. The wider the leaf, the more moisture it releases into the environment, the needles do this much less. Deciduous or coniferous trees predominate depending on the conditions. All trees have a trunk that grows taller and thicker over the years. In frozen soils, the roots do not germinate deeply, so the trees lack water and nutrients; in the tundra strip they grow very short with a thin trunk.