What 2 systems work together to prevent you from getting sick

Hi There!

Answer - Immune System, and Circulatory System, and Lymphatic System.

Why - These 3 systems all work together to keep the body in order so that it prevents the body from getting sick and keeping it heathly.

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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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