Primary Sources of Carbon
Heterotrophs: Organic compounds are metabolized to get carbon for growth and development.
Autotrophs: Carbon dioxide (CO2) is used as source of carbon.
Read more about this topic: Primary Nutritional Groups
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“A fact is a proposition of which the verification by an appeal to the primary sources of our knowledge or to experience is direct and simple. A theory, on the other hand, if true, has all the characteristics of a fact except that its verification is possible only by indirect, remote, and difficult means.”
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“One of the effects of a safe and civilised life is an immense oversensitiveness which makes all the primary emotions somewhat disgusting. Generosity is as painful as meanness, gratitude as hateful as ingratitude.”
—George Orwell (1903–1950)
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