The word "precursor" means "preceding requirement". This means that before a student is able to take courses in Calculus, it is required that the passed all the requirements for his Algebra. Calculus is a course which involves the study on derivatives and integrals.
"I have my fancies: it runs in the family. <span>Father and mother married, and mother came."</span>
Honestly, I would guess C. The author compares grief to a wet mop to show that when the time for grieving ends, each person must let go of it on his or her own.
The correct answers are
[<u>(b.) And in this flea our two bloods mingled be;]
</u>
<u>Thou know'st that this cannot be said</u>
and
[(d.) And pampered swells with one blood made of two;
And this, alas, is more than we would do.]
In this poem, the flea clearly symbolizes their love.
In the answer (b.), their bloods are mixed in this flea and this could metaphorically signify mixing their bodily fluids while engaging in intercourse.
In the answer (d.), it is clear that the speaker is denied intercourse with this woman and extends his argument from the sentence (b.) that their bloods mixed in the flee signify their physical union and that, despite what the society might suggest about her loss of virginity, there is nothing shameful about this act.