In one experiment, the heart rate of a mollusk at rest was measured at 0.3 cycles/s. How many times did the mollusk's heart beat in 1 min?

18 times

Explanation:

Heart rate = 0.3 cycles/s

Heart rate =

number of cycles = heart rate x time

But, 1 min = 60 seconds

⇒ number of cycles = 0.3 x 60

                                  = 18

Thus, the number of times that the Mollusk's heart beat in 1 min is 18.

not sure if this is what you'r looking for eubacteria and archaebacteria