Species evenness khjfjfgdhcjvk I just need 20 or more characters
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.
So dark linen thread structure is chromosome that we see. And and by molecule heritage that we contain.
Answer:
I am pretty sure it would be A
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