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D. pipes

Step-by-step explanation:

Water isn't to lungs

water comes from a sink but it doesn't have the same relationship to the sink as blood does to veins

Water isn't to the ocean like blood:veins because the water is uncontrolled and is everywhere

that leaves water being to pipes like blood is to vessels and the image describes it better than I do

d. it is a convex pentagon because it has five sides and none of the sides would extend into the inside of the polygon.

step-by-step explanation:

we have three similar triangles, because each has a right angle and shares an angle.   let's write the angles in order: opposite to short leg, long leg, hypotenuse.

cab similar to bad similar to cbd

or as ratios,

ca: ab: cb = ba: ad: bd = cb: bd: cd

we also know

ac = ad + cd

(ad+cd): ab: cb = ba: ad: bd = cb: bd: cd

(ad+cd)/cb=cb/cd

we have cb=6, ad=5 and seek x=cd.

we reject the negative root and conclude x=4

answer: 4