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Which of the following immune system components has been identified in almost all organisms studied?
X Chromosomes
One of the two types of sex chromosomes, where two X chromosomes typically characterize females and one X and one Y chromosome characterize males.
Monozygotic Twins
Twins that result from one fertilized egg splitting and developing into two embryos, sharing identical genetics.
Identical Twins
Twins that originated from the same fertilized egg, sharing all of their genetic material, and typically having very similar appearances.
Dizygotic Twins
Dizygotic twins, also known as fraternal twins, are produced from the fertilization of two separate eggs during the same pregnancy, sharing about 50% of their DNA.
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