Biological soil crusts<span> are communities of living organisms on the </span>soil<span> surface in arid and semi-arid ecosystems. They are found throughout the world with varying species composition and cover depending on topography, </span>soil<span> characteristics, climate, plant community, microhabitats, and disturbance regimes.</span>
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F) Thermohaline circulation pattern move surface water from equatorial regions to the poles
A substrate is a reactant that is catalyzed by an enzyme.
