What tells your body cells what to do in biology?

What tells your body cells what to do in biology?

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  1. This is a question that I’ve asked several biologists and instead of getting an answer I get a snicker. How do cells know to gather in the form of a leaf, or a frog or a human? The answer is, nobody knows.

  2. Types of chemical signals include:

    * Endocrine signaling (hormones are released and travel through the bloodstream to affect cells that are located at a distance)
    * Paracrine signaling (chemical signals act on a more local scale, as only nearby cells are affected; does not involve the bloodstream)
    * Autocrine (a cell secretes a hormone or chemical messenger that binds to receptors on the same cell)

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