A rigid cell wall is found in plants so they can hold themselves up.
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I think it is the last one
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A pH of 7 is neutral. A pH less than 7 is acidic. A pH greater than 7 is basic. The pH scale is logarithmic and as a result, each whole pH value below 7 is ten times more acidic than the next higher value. For example, pH 4 is ten times more acidic than pH 5 and 100 times (10 times 10) more acidic than pH 6.
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"B. organisms that use the same resource" is destined to cause the most competition between those organisms, since resources are scarce and almost always limited.
