Lampreys have long migrations from the ocean to ascend rivers for breeding. What kind of selective pressure favors behavior?

answer; a male inherits only one allele of the x-linked gene controlling hair color;

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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