These will be interesting for purposes of comparison and for testing duration of vitality later. "Ontario Teachers' Manuals: Nature Study" by Ontario Ministry of Education
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The length of the day/night cycle is determined by Earth's rotation and orbit.
1 the period during which something exists, lasts, or is in progress <for the whole
duration of the speech the bored audience fidgeted> Synonyms continuance, ...
Synonyms and antonyms for duration. 1. duration (n.) the period of time during
which something continues. Synonyms: continuance,; time scale,; span,; clocking
Antonyms for length at Synonyms.net with free online thesaurus, synonyms,
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