Biology · Human Reproduction
In placental mammals, how is the placenta formed?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1By interdigitation of the uterine wall and chorionic villi✓
- 2By interdigitation of the uterine wall and amniotic villi
- 3By plexus formation between allantois and uterine wall
- 4By plexus formation between amnion and chorion
Correct answer
By interdigitation of the uterine wall and chorionic villi
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