A) Placenta! mammals
B) Aquatic mammals
C) All eutherians
D) Prototherians
Correct Answer: D
Solution :
The egg laying mammals, i.e., ovoviviparous mammals belong to the class-Protheria. The eggs of prototherian are poiylecithal or megalecithal, i.e., contain more amount of yolk. The amount of yolk is always comparatively more than cytoplasm.
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