There's a theorem to the effect that every group of prime order
is cyclic. Since 5 is prime, the assertion in the question follows
from the said theorem.
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Yes, every subgroup of a cyclic group is cyclic because every
subgroup is a group.
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Meiosis is not cyclic; rather it is a linear process. It does
not cycle.
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required to excite the electrons of the chlorophyll and start
the cyclic and non-cyclic phosphorylation?