The middle ear is an what filled chamber?

The middle ear is an air-filled chamber.

Explanation:

The middle ear is an air-filled cavity/chamber that is between the tympanic membrane and the inner ear.

i think the answer would be d

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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