Multiple Choice
The ________ is a hollow ball of cells.
A) blastocyst
B) gastrula
C) morula
D) embryo
E) None of the answers are correct.
Correct Answer:

Verified
Correct Answer:
Verified
Q10: The embryonic development stage occurs during the
Q11: Figure 28.1<br> <img src="https://d2lvgg3v3hfg70.cloudfront.net/TB4856/.jpg" alt="Figure 28.1
Q12: Because of the great loss of spermatozoa
Q13: The ductus arteriosus provides an external short
Q14: Burrowing of the embryo into the endometrium
Q16: From which germ layer are muscles derived?<br>A)
Q17: Figure 28.1<br> <img src="https://d2lvgg3v3hfg70.cloudfront.net/TB4856/.jpg" alt="Figure 28.1
Q18: The _ is the site of early
Q19: Figure 28.2<br> <img src="https://d2lvgg3v3hfg70.cloudfront.net/TB4856/.jpg" alt="Figure 28.2
Q20: Figure 28.1<br> <img src="https://d2lvgg3v3hfg70.cloudfront.net/TB4856/.jpg" alt="Figure 28.1