Chemical signaling molecules called neurotransmitters are released from nerve cells (neurons) through vesicles. This is an example of

the "power" of a lens is its resolution power, or its ability to distinguish between to closely located points. with the low power lens, it is likely you will see the rough form of the hay and maybe some movement of dots around the hay. however, when observed with the high power lens, the detailed features of the hay become visible and the microbes being grown are more clearly visible.

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the glands which are associated with each description is given below: