Answer:
Hitched a ride or Humans brought it and planted it.
Explanation:
The hormone calcitonin, which is produced by the parafollicular or C cells of the thyroid, has the opposite effect on blood calcium levels as does PTH. I hope this helps! : )
Diffusion is across a semi-permeable membrane. The larger the membrane, the longer the diffusion takes
if I'm being honest I think it would be uhm C