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What were the dominant gases in Earth's second atmosphere?
Key Economic Role
A crucial function or position that significantly affects the economic performance or structure of a society or sector.
Artificial Insemination
A fertility treatment method involving the direct insertion of sperm into a woman's uterus to facilitate conception without sexual intercourse.
Surrogate Motherhood
An arrangement whereby a woman agrees to carry and give birth to a child for another person or couple, who then becomes the child's legal parents.
In Vitro Fertilization
A medical procedure whereby an egg is fertilized by sperm in a laboratory dish, and the resulting embryo is then transferred to the uterus for pregnancy.
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