Poets often avoid obvious rhyme... to avoid having to choose words.
to make the poem seem more like prose.
so the poem can be easier to read.
so the poem doesn't sound like a nursery rhyme.

d. because santiago thought any sharks would assume the marlin was part of the boat

i can you there : )

the sun warms our planet, and with the moon, creates the tides. the moon orbits the earth and in turn, the earth orbits the sun. because they appear to be the same size in the sky, the sun, earth and moon work together to create eclipses. when the moon is directly in between the earth and sun