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Describe four different varieties of counterbalancing, and explain the circumstances in which counterbalancing might not work.
Zygote
The first cell created through the fusion of an egg cell and a sperm cell, signifying the start of a new organism's growth.
Placenta
An organ that develops in the uterus during pregnancy, providing oxygen and nutrients to the growing fetus while removing waste products through the umbilical cord.
Primitive Duct Structures
Initial embryonic tubes which will later develop into various organs and systems in the body.
Wolffian
Referring to the embryonic duct system that, if stimulated by male hormones, develops into the male reproductive organs.
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