Riverain forests are:

A.It is an important seral stage of tropical thorn forest type.
B.It forms a fairly complete canopy 12-15 m. High
C.Which Acacia arabica jusually strongly predominates with varying amounts of Populus euphratica
D.All of the above

Alpine Scrub is:

A.Shrub formations often forming a quite dense cover 0.4 to 1.4 m
B.Shrub formations often forming a quite dense cover 0.5 to 1.6 m
C.Shrub formations often forming a quite dense cover 0.6 to 1.8 m
D.None of these