Which best describes a pilus ?
a. a tube that extends from a bacterium
b. a piece of dna transferred by a virus
c. a virus that causes a common cold
d. a protective shell around a bacterium

A. A tube that extends from a bacterium

Explanation:

A.P.E.X.

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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