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About four or five days after fertilization, a group of cells forms a ball-like structure. What is the name of this structure? A. Heart B. Placenta C. Blastocyst D. Stem Cell

About four or five days after fertilization, a group of cells forms a ball-like structure. What is the name of this structure? A. Heart B. Placenta C. Blastocyst D. Stem Cell
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About four or five days after fertilization, a group of cells forms a ball-like structure. What is the name of this structure? A. Heart B. Placenta C. Blastocyst D. Stem Cell

User Rubotero
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2 Answers

3 votes
I believe the answer is C.
User Falko
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4 votes
Your answer would be Blastocyst. 
User Bushmaster
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