Final answer:
Conception and birth are crucial stages in the beginning of human life from a biological perspective.
Explanation:
Conception marks the beginning of human life in the biological perspective. It occurs when a sperm fertilizes an egg, forming a zygote, which then develops into an embryo and eventually a fetus. The process of birth, traditionally known as the separation of the offspring from the mother's womb, has been redefined with the concept of partial-ectogestation where it involves both a 'birth-by-location change' and a 'birth-by-physiology change'.
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