It is the daily recurring period in an organism's life during which . . . behaviors necessary for survival . . . are conducted.
2.
An UnrealScript program that computes the lengths of recurring periods of various fractions in a given set of bases found that, of the first 15, 456 primes, ~ 39.344 % are cyclic in vigesimal.
3.
The 384 BW handled bomber alert duties, spending countless days and nights on alert status with their aircraft armed, fueled, and ready to go at a moment s notice . 384th aircrews also commonly participated in REFLEX operations, spending short but continually recurring periods of time at forward locations around the world.
4.
I believe diapause is correct for many temperate insects that " delay in development in response to regularly and recurring periods of adverse environmental conditions . " For the " Megachile " specifically, they overwinter as pupae or prepupae or ( pre-pupae ), though we don't have articles on the latter.