The difference is that secondary succession occurs when some vegetation and soil remaining after the disturbance, whereas primary succession occurs when very little or no vegetation or soil is present. 2 people found this useful.
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Forms and Dosages. Tramadol tablets are available in 50 and 100 mg strength and are usually taken several times a day. Extended release versions come in 100 mg, 150 mg, 200 mg, and 300 mg strengths. Hydrocodone extended release tablets are available in strengths ranging from 20 mg up to 120 mg.