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Complete the following sentences:
- Plant communities of the alpine life zone are often species-poor
due to ......................... .
- In mountainous areas, the ......................... ecological
gradients lead to a small-scale mosaic of different .........................
.
- ......................... between species or individuals leads to
the mutual reduction of their performance, whereas facilitation means
that ......................... .
- Since human activities in the alpine life zone are .........................,
the plant species of this zone are ......................... than
in lower regions.
- ......................... species are the result of a reduction of
their distribution area due to environmental changes, while .........................
are closely related species that result from their divergent adaptation
to differing environmental conditions.
- The high richness of vascular plant species in mountainous regions
is the consequence of ......................... .
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