The Question Below Refers to the Following Information Figure 451
-Melatonin Has Been Found to Participate in All of Experiment

The question below refers to the following information.
In an experiment, rats' ovaries were removed immediately after impregnation and then the rats were divided into two groups. Treatments and results are summarized in the table below
$\begin{array}{lcc}\hline&\text { Group } 1 &\text { Group } 2\\\hline (\text { Daily injections of }&&\\\text { progesterone (milligrams) } & 0.25 & 2.0 \\\text { Percentage of rats that } & & \\\text { carried fetuses to birth } & 0 & 100\\\hline\end{array}$

Figure 45.1
-Melatonin has been found to participate in all of the following except

A) skin pigmentation.
B) monitoring day length.
C) reproduction.
D) biological rhythms.
E) calcium deposition in bone.