Biology, 23.09.2019 11:00 Auttyrain3929

Which variable stars have pulsation periods between 1.5 hours and 1.2 days?
a. protostars
b. nebulas
c. rr lyrae variables
d. cepheid variables

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Which variable stars have pulsation periods between 1.5 hours and 1.2 days?
a. protostars