<p>anupkhanal34, I choose A
Serafina, I choose A</p>
<p>Can anybody give me a brief overview of what is necessary for the SAT_ Biology (M) exams....So I can prepare accordingly.</p>
<p>anhtimmy and cyge.......your choices are correct</p>
<p>The organs that work as biological clock are:</p>
<p>Hypothalamus
(Melatonin***) Pineal gland------only upto 12 years of age in humans
Thyroid gland
Parathyroid gland</p>
<p>Melatonin secretion is maximum at midnight and minimum at mid-day</p>