Trisomy=3 chromosomes; 1 more than the required pair (2)
21=the type of chromosome
So, here we can eliminate A and B.
Now we have C and D.
I know that when sperm cell(s) simultaneously fertilize [an] egg, a class of identical twins will form. Therefore, we can eliminate D, leaving us with merely C. Henceforth, C is your final answer.
The answer to your question is,
D. Four haploid daughter cells.
-Mabel <3
Amino acids is the monomer of protein
The answer is mechanical weathering
The cell membrane is semi-permeable, kind of like a filter to let some molecules in and keep larger molecules out