When the mass of cells that make up the early embryo divide to form two independent groups of cells, the resulting twins are _______.

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When the mass of cells divide to form two independent groups of cells, they can develop into identical twins, also referred to as monozygotic twins. Fraternal twins, also known as dizygotic twins, occur when two eggs are fertilized by two different sperm. Conjoined twins occur when the division of the egg occurs later in the development process, resulting in the twins being physically attached to each other.

When the Mass of Cells That Make Up the Early