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Fertilisation must happen in the distal uterine tube because an unfertilised oocyte cannot survive:

A7 days
B72 hours
C7 hours
D7 minutes
Answer & Solution
Correct answer: B. 72 hours
1. The journey to the uterus takes time. 2. The oocyte has a short window. 3. It cannot survive the 72 hour trip. _Source: OpenStax Anatomy and Physiology 2e, Chapter 28, Development and Inheritance._
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