In the feedback system that maintains normal calcium ion levels in the blood, how do the hormones produced by the thyroid and parathyroid glands
interact?
A. The thyroid controls the parathyroid.
B. One is a backup system for the other.
C. They have opposing effects.
D. They reinforce each other.

by your profile picture on the top right there is an icon that has two people click that and there is a search

                          - jayden

1# the answer is c

2#the answer is a

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hope this