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Explain the difference between stratified and cluster sampling.
Estrogen
A group of steroid hormones that play an essential role in regulating female reproductive physiology, including the menstrual cycle and reproductive system development.
Progesterone
A hormone produced by the corpus luteum, known as a steroid, that encourages the uterus to get ready for pregnancy.
Umbilical Cord
A flexible cord-like structure containing blood vessels and attaching a mammal fetus to the placenta during gestation.
Extraembryonic Membrane
Membranes outside the embryo that contribute to the developing embryo's life support system in various ways, such as gas exchange and waste management.
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