A difference between a morula and a blastula is that the:
A) blastula has fewer cells than the morula.
B) morula is a solid ball of tightly packed cells, whereas the blastula has a cavity in the center.
C) morula is a well-developed embryo, and the blastula is an earlier stage of development.
D) morula has a hollow center, but the blastula doesn't.
Answer: B
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The most oxygenated blood is indicated by the letter ____
a. A b. B c. C d. D e. E
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