1. For each of the following organisms, report its relative growth at the various pH levels. Organism Escherichia coli Staphylococcus epidermidis Saccharomyces cerevisiae Lactobacillus delbruckii subspecies bulgaricus pH 3.0 0 0 0 pH 5.0 ++ 0 10 pH 7.0 ++ + +++ pH 9.0 + 0

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Soil Ecosystem

Soil provides a habitat or living environment for a large number of different species of organisms as well as plants. It provides all the essential nutrients and minerals for plants to grow. All these together form the soil ecosystem.