A) Kangaroo
B) Platypus
C) Monkey
D) Both [a] and [c]
Correct Answer: D
Solution :
Blastocyst is a type of blastula. In this, the blastula is a cyst with 2 types of cell: an outer epithelium like layer of trophoblast or nutritive cells and an inner mass of formative cells collectively called embryonal knob, eg, mammals (Metatherian and Eutherian mammals).
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