Photosynthetic organisms, such as plants and algae, depend on the availability of two important inorganic nutrients, and

it's c. (to reduce the greenhouse effect/carbon gasses)

a. by using fur or clothes to trap heat energy near the body

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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