Answer:
<em><u>Pancreas</u></em> is Insulin is released when blood sugar levels are too high
<em><u>Thymus Gland</u></em> is Your immune system fight off an infection
<em><u>Pineal Gland </u></em>is you begin to feel sleepy after a long session
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Explanation: Hope it helps :)
I'm pretty sure it's primary growth. I might not have studied this type of biology yet, but secondary growth would definitely not be the answer.<span />
Sugar-phosphates and nucleotides