Card 2 / 21: View this time-lapse movie ( http://openstaxcollege.org/l/conceptus ) of a conceptus starting at day 3. What is the first structure you see? At what point in the movie does the blastocoel first appear? What event occurs at the end of the movie?
Answer:
The first structure shown is the morula. The blastocoel appears at approximately 20 seconds. The movie ends with the hatching of the conceptus.
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