3D LASER SCANNER FOR PALEONTOLOGY TECHNOLOGY
Carbon is listed twice my dude :)
M phase is the period in the life of the cell when it is conducting cell division
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 homeostasis