Insulin and glucagon, are both are secreted from islets of Langerhans at the pancreas<span />
Law of Magnetism. The most basic law of magnetism is that like poles repel one another and unlike poles attract each other; this can easily be seen by attempting to place like poles of two magnets together.
Direct observation is an observation you make first hand. It is something you see with your own eyes and observe yourself.
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Hormones and water balance are another two conditions which are maintained by cells.
