The correct answer is B) chance
Allele frequencies in a gene pool change completely due to chance.
<span>The answer is contralateral. It means that the reflex happens on
the contradictory side of the body from the stimulus. To produce this reflex, divisions
of the afferent nerve fibers cross from the stimulated side of the body to the
contralateral side of the spinal cord. There, they synapse with interneurons,
which, in turn, excite or prevent alpha motor neurons to the muscles of the
contralateral limb.</span>
I think it the answer is C ( The relationship between the bacteria and the ticks is commensalism, and the relationship between ticks and humans is parasitism.
-- Alina (:
