Multiple Choice
The partial twinning that led to the births of conjoined twins Abby and Brittany Hensel must have happened during the first two weeks of gestation,because the girls
A) share tissues that descend from ectoderm,endoderm,and mesoderm.
B) share only tissues derived from mesoderm.
C) were born on time.
D) have two separate nervous systems.
Correct Answer:
Verified
Correct Answer:
Verified
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Q16: The zona pellucida is<br>A)a protective layer around
Q17: The tubular part of the uterus that
Q18: An embryo develops rudiments of all organs
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Q23: The inner cell mass<br>A)helps form the amnion.<br>B)becomes
Q24: The ovary of a newborn girl houses