Example: barber
Ecosystem functions and services
(Alexander et al. 1997). Similarly, although sulfur is an essential element in proteins, excessive sulfur emissions from human activities lead to sulfuric acid smog and acid rain that harms peo-ple and ecosystems alike (Alexander et al. 1997). Phosphorous (P) scarcity limits biological nitro-gen fixation (Smith 1992). In many terrestrial eco-
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