HELP PLEASE Which of the following is a good description of biological clocks? a) A light-dark cycle of 24 hours during which entrainment takes place b) External chemical systems that are regulated by

HELP PLEASE

Which of the following is a good description of biological clocks?
a) A light-dark cycle of 24 hours during which entrainment takes place
b) External chemical systems that are regulated by time and control circadian rhythms c) None of these
d) Internal chemical systems that are regulated by nature and control parts of the body

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HELP PLEASE Which of the following is a good description of biological clocks? a) A light-dark cycle of 24 hours during which entrainment takes place b) External chemical system…

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