The molecule ethylbenzene is considered a(n)
a. alkane
b. alkyne
c. cycloalkane
d. cycloalkene

d. Cycloalkene

Explanation:

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In this case, ethylbenzene whose structure is shown on the attached picture consists on a benzene ring that has an ethyl radical. In such a way, as benzene is understood as a cyclohexene having three interleaved double bonds, that is cyclohex-1,35-triene, it is considered as a cycloalkene.

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indicate valleys, hills, steepness and gentleness of slopes.

explanation:

contour lines on a map indicate elevation, or depth. numeric notations on contour lines refer to the level of elevation, or height about sea level.

i think   the answer is c hope i'm right