Biology, 13.12.2019 07:31 cmflores3245

Circadian rhythms are genetically controlled phenomena where organisms are able to control behaviors, even in the absence of environmental cues, for a period of time approximating 24 hours. paramecia feed and mate based on circadian rhythms. plants open and close their stomata based on these genetic controls. animals demonstrate periods of waking and sleeping that follow 24 hour trends, even without light cues. what is the likely explanation for the evolution of circadian rhythms?

a) circadian rhythms evolved in a common ancestor to life, but was lost in prokaryotes.

b) circadian rhythms evolved in a common ancestor to life and is present in all life forms.

c) circadian rhythms evolved at least three separate times, in protists, plants, and animals.

d) circadian rhythms evolved on the branch containing eukaryotes and are found in all eukaryotes.

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