One similarity between photosynthesis and cellular respiration is that both involve:

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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if you look up in the top right corner you'll see your current profile picture, click than click "view profile" you'll be able to change it there.