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 :)
Tissues form when many similar specializes cells come together.
The level of complexity in organisms from smaller to larger are:
Cells, tissue, organ, organ system, and organism finally.
Cells makes up tissue, tissue makes up organ, organs makes up organ systems, and organ systems makes up an organism.
Therefore, if the same type of cells come together, they'll make up tissue.