Consideration of the ordered array of atoms or ions is basic to an understanding of the results.
Complex numbers are necessary to the mathematical treatment.
Artificial ventilation is required to maintain a normal atmosphere.
The presence of an inert strand is requisite for these processes.
Considerations of phase equilibria are essential to (or necessary for) an understanding of any mass-transfer process.
Calcium is also essential in many biological functions of the vertebrates.
Carbon dioxide is essential to synthesis.
Minute in amount but indispensable for life are the hormones and vitamins.
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