Directions: An introductory sentence for a brief summary of the passage is provided below. Complete the summary by selecting the THREE answer choices that express the most important ideas in the passa
A.Mostanimalssurviveandreproducesuccessfullywithoutcoordinatingtheiractivitiestoexternalenvironmentalrhythms.
B.Thecircadianperiodofananimal’sinternalclockisgeneticallydeterminedandbasicallyunchangeabl
e
C.Environmentalcuessuchasachangeintemperatureareenoughtoresetananimal’sclock.
D.Animalshaveinternalclocksthatinfluencetheiractivitiesevenwhenenvironmentalcuesareabsent.
E.Animalsarelessaffectedbylargedifferencesbetweentheirinternalrhythmsandthelocalsolardaythanarehumans.
F.Becauseananimal’sinternalclockdoesnotoperateona24-hourcycle,environmentalstimuliareneededtokeepthebiologicaldayalignedwiththesolarday.