What is peristalsis and where does it occur?

Peristalsis is a series of wave-like muscle contractions that move food through the digestive tract.

Explanation: It starts in the esophagus where strong wave-like motions of the smooth muscle move balls of swallowed food to the stomach.

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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