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The outer shell cells of the blastocyst are called:

ATrophoblasts
BThromboblasts
CTropocollagen
DTrichoblasts
Answer & Solution
Correct answer: A. Trophoblasts
1. Their name refers to nourishing. 2. They form the fetal part of the placenta. 3. They are the trophoblasts. _Source: OpenStax Anatomy and Physiology 2e, Chapter 28, Development and Inheritance._
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