What is a blastocyst? A- a sphere of cells surrounding a hollow center B- a two celled developing structure C- A zygote covering to prevent sperm from entering D- A solid mass of about one thousand c

What is a blastocyst?

A- a sphere of cells surrounding a hollow center

B- a two celled developing structure

C- A zygote covering to prevent sperm from entering

D- A solid mass of about one thousand cella

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