Answer:
A stem is the root or roots of a word, together with any derivational affixes, to which inflectional affixes are added. Discussion: A stem consists minimally of a root, but may be analyzable into a root plus derivational morphemes. ... The verbs tie and untie are both stems.
The period is the time it takes the satellite to make a complete orbit around the central object. As the distance increases, so does the period because the orbit becomes longer because the radius increases.
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James D Watson and Francis Crick
Answer:
Pathway of air: nasal cavities (or oral cavity) > pharynx > trachea > primary bronchi (right & left) > secondary bronchi > tertiary bronchi > bronchioles > alveoli (site of gas exchange)
Explanation:
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The answer is A) they provide a source of energy.
