Use the Figure to Answer the Following Question In an Experiment, Rats' Ovaries Were Removed Immediately After Impregnation

question 49

Multiple Choice

Use the figure to answer the following question.
$$\begin{array} { | l | c | c | } \hline & \text { Group 1 } & \text { Group 2 } \\\hline \begin{array} { l } \text { Daily injections of } \\\text { progesterone (milligrams) }\end{array} & 0.25 & 20 \\\hline \begin{array} { l } \text { Percentage of rats that } \\\text { carried fetus to birth }\end{array} & 0 & 100 \\\hline\end{array}$$
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. The results most likely occurred because progesterone exerts an effect on the ________.

• A) general health of the rat
• B) metabolism of the uterus
• C) gestation period of rats
• D) number of eggs fertilized

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